| 34221 | How can you tell if a diamond is real or fake? |
| 27151 | Why do your ears ring? |
| 23512 | Are cats and dogs colorblind? Do cats' eyes glow in the dark? |
| 20895 | Can you turn gas into a solid form? |
| 18810 | How are elements named? |
| 18616 | Does sugar make you hyper if you eat a lot of it? |
| 17374 | How is glass made? |
| 15786 | Why do your bones crack when you walk up or down stairs sometimes? |
| 15714 | Why do your cheeks turn red when you get embarrassed? How come when we get nervous our heart feels like it's beating faster? |
| 15412 | Isaac Newton discovered gravity, but why did he call it gravity? |
| 14500 | Why does squinting help people with vision problems see better? |
| 13549 | How do relaxers on your hair work? |
| 12735 | Do evergreen trees give off oxygen all year round? |
| 12024 | Why do men grow hair on their face, while most women don't? |
| 11683 | I have a recipe to make homemade glue. The recipe asks you to heat skim milk and vinegar until the milk curdles. Then it asks to remove the liquid from the mixture and add sodium bicarbonate to the curdles. What is sodium bicarbonate and why is it an important ingredient to make the glue? |
| 11582 | How does a fluorescent light bulb work? |
| 11143 | Why do crystal glasses give off sound when you rub them with a wet finger? |
| 11092 | Why do crickets make noise at night? |
| 10828 | How can you tell if a ruby is real or fake? Is there a test I can do? |
| 10820 | If hydrogen and oxygen are both flammable why doesn't water burn? |
| 10769 | How many dimensions are there? |
| 10055 | Why does soap make bubbles? |
| 10028 | How do you make a magnet? |
| 9764 | Why are humans born with eyes open and puppies are born with eyes closed? |
| 9563 | Why can't you put metal in a microwave? |
| 9526 | How do solar energy cars work? |
| 9481 | Why do dolphins live in the water when they are mammals? |
| 9444 | Who invented math? |
| 9378 | Why are robin's eggs blue? |
| 9374 | How does a glow-stick work and how come neon glows? |
| 9370 | How many species of bats are there? Why do bats live in caves? How big do bats get? Do bats go underwater? How long do bats live? Do bats mate and give birth while flying or hanging? |
| 9266 | How does sun block work? |
| 9200 | What is the most common type of blood? |
| 9028 | Is it safe to touch mercury bare handed? Are you going to be poisoned if you touch it? |
| 9000 | Why do ships float? Why don't ships sink? |
| 8801 | Where does static electricity come from? How does it get in my cat's fur? Why is it worse in winter? How do dryer sheets get static out of clothes? |
| 8757 | Will your skin change color if you eat enough of a colorful food? (For example, if you eat a lot of carrots, will your skin turn orange?) |
| 8746 | Can humans ever see in the dark with no night vision glasses or other aids? |
| 8242 | I heard that peppermint candy will help you do better on a test. Is this true? And, is there anything in peppermint candy that will boost my scores? |
| 8224 | Water doesn't spoil, but why do some water bottles have expiration dates? |
| 8181 | How does a fire hydrant work? |
| 8051 | Can animals get a sunburn? |
| 7902 | Why do we have fingernails? |
| 7841 | Why does fruit ripen? |
| 7642 | How do you grow seedless watermelons? |
| 7589 | Is sinking sand real or myth? If real, please explain how it works. |
| 7571 | Will a candle burn in a space ship where everything is weightless? |
| 7556 | Why does salt melt snow? |
| 7411 | How do you make a laser? |
| 7353 | Is it possible to determine the resonance frequency of an object that has a diameter in nanometers in size (such as a cell)? |
| 7286 | Why is element 43 made by man and none of the elements around it are? |
| 7275 | Do fish see in color? |
| 7171 | Why does the wind blow? |
| 7122 | How do MRI's work? What are all the ticking and banging noises? |
| 7068 | Why do different balls bounce differently? |
| 7020 | What if you had no white blood cells? |
| 6967 | Why doesn't gold rust? |
| 6793 | Why is grass green? |
| 6744 | Why is the planet Mars red? |
| 6722 | What is the volume of water in a gallon of ice? |
| 6714 | How does the CCD work in a digital camera? |
| 6588 | How do minerals and nutrients form? Why do some foods have metals in them? |
| 6536 | Why can't we hold our breath like the whales? |
| 6527 | How can the sun burn without oxygen in space? If there is oxygen in space why do astronauts need oxygen? |
| 6520 | How does a copy machine work? |
| 6452 | How do you split atoms? |
| 6409 | Does every one in the world have cancer cells in their body? |
| 6402 | How does the desalination of water work? |
| 6401 | Does the mass of the Earth increase with the increasing population? If not, why not? |
| 6330 | How does burning gasoline make a car move? |
| 6321 | How does sonar work? |
| 6294 | What happens at the edge of a diamond? How does the carbon end? |
| 6291 | What is lightning and what makes thunder rumble? |
| 6171 | Why does a cow have so many stomachs? |
| 6109 | Why does the moon rise and set in a few hours some nights and on other nights, the moon will rise at early darkness and still be in the sky the next morning? |
| 6086 | Where does the salt in the sea come from? |
| 6084 | Why can birds fly but penguins can't? |
| 6041 | If plastic is made to be biodegradable, then won't the plastic forks and spoons we use dissolve in our mouth? |
| 6041 | What would happen if I dyed water green with food coloring, then put it in a humidifier? I was going to do it but my mom made me stop at the last second. |
| 5992 | Why do babies get their parents features? |
| 5988 | Why is it that when you burn a contained candle the wax disappears? Does it evaporate? What is the chemical reaction? |
| 5961 | Why do bees sting? |
| 5952 | Why does your tongue get stuck to metal in the winter? |
| 5931 | How are crystals formed? |
| 5905 | What color is Saturn, and are there planets in other galaxies? |
| 5876 | How do you make a man made element? |
| 5868 | Where does liquid nitrogen come from and how is it made? |
| 5847 | How do CDs Work? |
| 5834 | Are there any nontoxic ingestible fluorescent materials? |
| 5801 | Is a horse's leg bone bigger than a human leg bone? If so, when a horse's bone breaks why is it so much harder to heal? |
| 5777 | With California blackouts and amazingly high heating costs, are alternate energy sources becoming closer to "hitting the market" than ever? If so, what are they and what are their pros and cons? |
| 5768 | How can hummingbirds fly backwards? |
| 5708 | How do airplanes fly? |
| 5627 | How do you clone plants? |
| 5623 | Why do people get seasick or carsick? |
| 5619 | I know that water can put out a fire. What does liquid nitrogen do to a fire? |
| 5617 | Why do some dogs eyes reflect red instead of yellow and does this have anything to do with their coat type? |
| 5606 | How does your body move? Does the brain send it messages? |
| 5606 | What makes Band-Aids sticky? |
| 5585 | How do butterflies fly? |
| 5525 | How hot is it at the earth's core? Does the heat affect our temperature? |
| 5521 | How do you jam a radio broadcast? |
| 5510 | How are marshmallows made? |
| 5498 | How many earths will fit in the sun? |
| 5490 | Why do we get a shock from electricity? |
| 5469 | How do new materials that are used in swimming suits work and where do they come from? |
| 5462 | Why are cats so flexible? |
| 5453 | What would happen if a tornado started in the southern hemisphere and progressed into the northern hemisphere? Would it change directions? |
| 5423 | Why do humans enjoy music? What is it about the brain that makes sounds translate into pleasure and other emotions? |
| 5405 | From what metals are electromagnets made? |
| 5402 | If icebergs are made of fresh water, why don't they melt in the salt water of the ocean? |
| 5393 | Why is it generally colder at higher elevations? |
| 5370 | If the electrons are attracted to the protons, why don't they come crashing into the nucleus? |
| 5343 | Is popping popcorn a physical or a chemical change? |
| 5337 | Do flies have hearts? |
| 5282 | What chemical properties, if any, makes things sticky? |
| 5263 | How long does it take for the so-called biodegradable plastic cutlery that is now on the market to decompose? What is the energy cost to produce it in the first place? Are they truly an environmentally responsible product? |
| 5256 | If there is a flash of light inside of a cube, whose walls are all mirrors on the inside will the light keep reflecting off of every wall infinitely? Or will it just go away? What will happen? |
| 5221 | What material is flame made of? |
| 5216 | How are the colors in a rainbow made? |
| 5209 | How did animals get to have rabies? |
| 5204 | What does a flying fish do to fly? |
| 5166 | What formula or method was used to determine Avogadro's number? |
| 5156 | Recycled metal looks like the same color as non-recycled metal. When soda cans are recycled, what happened to the paint or dye that was on top of the aluminum? |
| 5146 | If you could drill a tunnel all the way through the earth and dropped a rock in it, what would happen? |
| 5132 | How does Aspirin work? |
| 5107 | Why are combustion reactions exothermic (why is fire hot)? What makes these reactions produce heat the way they do? |
| 5099 | If you take a substance like water and were able to get it to absolute zero, where supposedly the molecules would cease to move, and then you reheated it, would the molecules recover and start to move again? |
| 5097 | Does the moon have lithospheric plates? Do other planets have distinct layers such as the inner core, outer core, and mantle, like the earth does? |
| 5079 | Why do computers freeze up? |
| 5078 | What evidence do we have that continents were connected? |
| 5072 | How come we have two eyes but see only one of everything? |
| 5064 | Why is carbon the building block of matter? |
| 5055 | How do chameleons/anoles change colors? |
| 5053 | How are dryer sheets manufactured? |
| 5043 | Why does the sun have black spots? |
| 5037 | Why does a nuclear bomb create so much energy with such a small amount of mass? Why is there so much nuclear fallout with such a small amount of nuclear material in the bomb? |
| 5033 | Why are some dishes safe to put in the oven, microwave, and dishwasher, but others aren't? |
| 5015 | Why do birds bob their head when they walk? |
| 5011 | How do we know how old the earth is? |
| 5002 | What makes the sun hot? |
| 5001 | My dad just got some new tennis shoes with that reflective stuff on them. What is the difference between those reflective stickers and the glow in the dark stars over my bed? |
| 4926 | How do fuel cells work? |
| 4924 | How do underwater flares and torches work, when water puts out fires? |
| 4920 | What are Saturn's rings made of? |
| 4919 | How does a firefly make its light? |
| 4896 | Why do chameleons change color? |
| 4849 | How do they put the flavor in candy? |
| 4812 | Is it imaginable that an AIDS vaccine will be developed? |
| 4793 | Is time travel possible? |
| 4769 | After mixing 1oz of cornstarch and some water together, why does it get hard when pressure is applied? And then when the pressure is released, the mixture becomes drippy? |
| 4762 | Why is there discussion as to whether or not glass is a liquid or a solid? |
| 4757 | Why is it normal to move your arms when you walk or run? |
| 4739 | I know that a TV screen is made up of lots of blue, green and red dots, so why does the light coming out of it look blue from a distance? |
| 4704 | What happens if you go into space with a regular plane? Do you explode? |
| 4703 | Why is the center of the earth hot? |
| 4699 | Why do cats' eyes glow in the dark? |
| 4690 | Why does the gravitational pull of the moon control the tides of the sea? |
| 4680 | Can the human eye be compared to a computer monitor? Does the view we see refresh itself or is it more like live feed? If something was moving too quickly, would it appear jumpy like a low frames/second? |
| 4677 | What is nanotechnology used for? Why do scientists study it? |
| 4649 | Can lava rock be heated and turned back into lava? |
| 4642 | Why do frogs or certain frogs have to stay in the water? I know its their habitat but why can't they leave and stay on land? |
| 4634 | Why do deer lose their rack in the winter? |
| 4618 | Why don't you see two things if you have two eyes? |
| 4608 | How does a particle accelerator work and why is it so useful? |
| 4595 | How would gravity function if the earth were a torus? |
| 4587 | How does the moon cause tides and how is it that when it is high tide in one place it can also be high tide on the other side of the world? |
| 4573 | Why do the electrons of an atom orbit around the nucleus? |
| 4549 | What causes the earth to rotate and why? |
| 4548 | Why is vegetable oil able to be used as a power source for automobiles? |
| 4540 | How exactly do catalysts lower the activation energy of bonds? |
| 4508 | Why does the earth have more water than land? |
| 4504 | Is AIDS the only incurable disease? |
| 4502 | How are submarines able to go down so deep under the water, and then surface? |
| 4494 | Why does rain fall in drops rather than gush down? |
| 4480 | Where do tornadoes come from? |
| 4473 | How do dreams and nightmares occur? Why do we sometimes remember our dreams, and other times we do not remember? Do we dream every night? |
| 4396 | Why is it that when I hold a stick over a fire it ignites without touching the coals? |
| 4392 | When a water surface reflects something (when looking from the top), does it undergo total internal reflection? |
| 4352 | Why does the earth behave like a magnet? |
| 4341 | What is the lowest temperature possible? |
| 4332 | Can one of the professors write about some of the bacteria that are becoming immune to antibiotics? We are concerned when they are putting antibiotics in some meats now, and talking about antibacterial soaps having an effect on the immunity. |
| 4327 | Why do stars twinkle? |
| 4318 | Can there be hummingbirds in Croatia? |
| 4308 | What about the atomic structure of a substance determines its color and/or luster? |
| 4281 | How do people think? What are memories stored as? Where is it stored? How is it recalled? How can I have independent thinking? |
| 4275 | How do microwave ovens work? |
| 4274 | What is Jupiter made of? |
| 4267 | When is dry ice a fluid? |
| 4265 | What is spontaneous combustion? Is it a myth? What causes it? |
| 4264 | If humans only use 10% of their brains, what is the other 90% doing? |
| 4264 | Why don't birds' legs get frostbite? Because they are not covered with feathers, they could get frozen, couldn't they? |
| 4235 | How do they compress oxygen into pure oxygen tanks? |
| 4226 | When I place a straw in a glass of soda, the part of the straw in the water appears bigger and also seems bent as I look down into the cup. Why does it look bigger and why does it appear to bend upon entering the water? |
| 4213 | How many different kinds of dinosaurs are there? |
| 4212 | Why are apes different from humans and monkeys? |
| 4206 | If fire needs air to breathe and the sun is a ball of fire, how does the sun stay lit if there is no air in space? |
| 4205 | Why or how can some animals make a limb for themselves? |
| 4195 | How come deserts have sand instead of dirt and soil? |
| 4182 | How accurate is the VSEPR model of molecular geometry for predicting the shapes of large, complex molecules? |
| 4157 | How can electricity run things? |
| 4118 | Do photons have mass? If not, then how does gravity affect light (i.e. Black holes)? |
| 4111 | Why, when you breathe in helium, does your voice change? |
| 4101 | Why is there zero gravity in space? |
| 4100 | How can information be sent on radio waves, etc? How can things that have no mass contain messages? |
| 4098 | How do computers communicate with Chinese characters? |
| 4090 | We were measuring water. There was some water on the table. There was water under one of the cups. We tried to pick up the cup lightly and it stuck. Why? |
| 4086 | Why do baby fawns have spots? |
| 4081 | What is fire? Does it have mass? |
| 4068 | Can only water evaporate or can other liquids? |
| 4044 | How big is the universe and how did we figure it out? Where has the farthest telescope seen? How far have people sent the furthest satellite? |
| 4030 | How exactly are nocturnal animals able to see in the dark? |
| 4027 | What is Vitamin A and what does it do? Also, what kinds of elements are in Vitamin A? |
| 4026 | Why does my milkshake stay thick even when it warms up? Shouldn't it get thinner as it melts? |
| 4016 | If light has no mass, why is it affected by gravity?
I read that light can not escape a black hole because of the gravitational pull and that light from distant stars bends around our sun's gravitational field, making it appear that they are in a different direction from Earth than they actually are. I also read that light is massless, and that gravitational force is a function of mass. These seem inconsistent. |
| 4005 | If light travels in a straight line, why is lightning crooked? |
| 3959 | Is carbon dating an effective way of finding how old something is? |
| 3959 | Why is a tomato considered a fruit and not a vegetable? |
| 3954 | Why doesn't it rain inside a house? |
| 3950 | How small is the smallest thing you can see under a microscope? |
| 3944 | What is a mole? |
| 3942 | What was the gas mileage for the earliest cars made? |
| 3926 | What is fiber optic cable and what advantages does it have over other technologies? |
| 3918 | Why do cats shed all year round even on the coldest days? |
| 3913 | How come there is no thunder and lightning in the winter time? |
| 3911 | Are there life forms (animals, insects) that live in underwater volcanoes? |
| 3908 | What was there before the "Big bang?" Why did it happen? |
| 3907 | Can fire stay lit in space? For example, when a rocket takes off into space, there is fire coming out of the engines, but while in space is there still fire coming out of the engine? If not, how does the rocket get propelled without the force of the engine fire? |
| 3899 | When hydrogen explodes and combines with oxygen, where does the energy that is released in the explosion come from? |
| 3885 | Who determined the speed of light and how did they do it? |
| 3879 | Apparently Romer measured the speed of light due to a delay in the satellite of Jupiters orbits. But how did he measure it - he must have had a succession of measurements over say 1 year, yet been able to time very accurately the advance or retard. How did he do this since he didn't have an accurate pendulum clock. ie what was his actual experimental method - nowhere can I find a good description. |
| 3875 | What are MEMS and why are they an important scientific break through? |
| 3871 | What are quasars, what causes them to be formed? |
| 3861 | How do engines start? |
| 3857 | How do you clean bones you would like to use in a display? |
| 3841 | How do you make a rock into a metal or a crystal? |
| 3819 | Why are computer chips written on silicon? |
| 3806 | How can so much information be crammed into such a small space on a microchip? |
| 3793 | It has been said that man cannot produce a perfect sphere. How can that be said if we have nothing perfectly spherical as a reference to begin with? |
| 3788 | How is ink made? |
| 3775 | How do we get cavities from candy and why do our teeth turn gray/blackish? |
| 3768 | Why does motor oil prevent paint from drying? |
| 3759 | Why do coals appear 'red hot' in a fire and is this the hottest spot in a fire? |
| 3753 | What makes spider silk so strong? |
| 3730 | Why does skin wrinkle and what causes it as you get older? |
| 3723 | What is the highest microscope power on an electron microscope? |
| 3722 | Why is the sky blue? |
| 3722 | Have nanobots already been created? What are nanobots made out of? Are they decomposable or will they just build up? What do they use for a power source? |
| 3710 | How many active volcanoes are there in the world? |
| 3689 | There are many types of dwarf stars, what are they and what makes them different? |
| 3672 | What causes a heat sensitive material, such as a mood ring, to change color when it's temperate is altered? What is this material made of, and where else might it be used? |
| 3668 | Is the ozone layer affecting our seasons? How? |
| 3655 | How does RADAR work? |
| 3629 | What shape are stars? |
| 3617 | Why do dogs have padded feet? |
| 3616 | Can we ever make nuclear powered cars in the future? |
| 3612 | How do polar bears get water in the Artic? I thought all the fresh water was frozen in the ice caps? |
| 3597 | What affect will the new "gene-altered" foods have on us? |
| 3596 | Can a cellular phone work in space? How far into space can you go without losing communication? |
| 3588 | Why do stars form pictures? |
| 3579 | How does a lens bend light to focus on a point? |
| 3549 | If solids, like glass and ice, are made of tightly packed molecules, how can we see through them? |
| 3548 | Why do they say there are two sides of your brain? |
| 3536 | How is the equation E=mc2 carried out physically? |
| 3513 | How do you make a computer game? |
| 3510 | Why can't we swallow our food whole like snakes? |
| 3499 | Specifically, we have paperwork that gives different names for several of the new elements: Db for number 105 instead of Ha and Bh for number 107 instead of Ns. Do we have names for 110, 111, or beyond? What is the last one that was made? |
| 3492 | Why do boomerangs come back when you throw them? |
| 3484 | In an accelerator when an electron and positron collide, for a short time they form pure energy. Where does the energy come from if energy can't be created or destroyed and where does the matter go? |
| 3482 | How many types of rocks are there throughout the world? |
| 3464 | Does magnetism work in space? |
| 3453 | What would the result be if the acid in your stomach turned into a base? What effect would it have on your body? |
| 3447 | What causes lightbulbs to be so inefficient, and how is efficiency rated? |
| 3428 | How did people find out a day is 24 hours? |
| 3402 | Is it possible to use electrolysis or another method to separate NaCl into sodium and free floating chlorine gas? |
| 3401 | What are hydrothermal vents? |
| 3392 | Why is the sky a blaze of color during sunset in Arizona? |
| 3390 | Does Jupiter rotate and change place with other planets (like Pluto)? |
| 3381 | Why can't fish breathe on land? |
| 3353 | If the mantle can rise when weight has been lifted off of it (isostasy), then why are some islands sinking into the ocean? |
| 3341 | Why do the moon and the sun seem to change colors? |
| 3338 | Is Pluto small enough to ever drift out of orbit? |
| 3335 | What is the exact use of the International Space Station? How long is it going to take to build? How does it work? |
| 3326 | Our textbook tells us the speed of the molecules that make up the air we breathe, but the speed it gives us is faster than the speed of sound. Why don't we hear sonic booms as when an airplane breaks the sound barrier? Are the particles just too small for us to hear the booms? |
| 3297 | Is it possible that there is an asteroid bound for earth? |
| 3294 | Is it possible to snow at any temperature below 32 degrees Fahrenheit? Is it ever possible for it to be too cold to snow? |
| 3292 | Why is a mirror left-right reversed, and not up-down backwards? |
| 3286 | What is dark matter and what kind of gravitational effects does it have on the cosmos? |
| 3279 | Why do turtles have shells? |
| 3257 | Is being a scientist fun? How is it fun? |
| 3249 | Why does each snowflake have a different shape? |
| 3218 | How efficient is photosynthesis compared to the amount of light energy delivered to the earth? |
| 3218 | How does a Van De Graaf generator work and what is it made from? |
| 3210 | How is it that no matter where a person stands on earth they are always upright? Why aren't people in Antarctica upside down? |
| 3201 | What is in batteries that causes electricity? |
| 3200 | What is a x-ray? |
| 3197 | What is ceramic made of? |
| 3189 | What shape can a volcano be? |
| 3154 | What is anti-matter? Does it exist naturally? Does it look and feel like regular matter? How do scientists make anti-matter? |
| 3142 | Why do drops of water cling to glass? |
| 3099 | What is it about the human eye that limits the types of wavelengths in the electromagnetic spectrum that can be seen as visible light? Why are other animals capable of interpreting infrared waves as well? |
| 3089 | What kinds of plants live on the bottom of the ocean? |
| 3073 | What is a Green Flash? |
| 3066 | How many other galaxies do we know of? Do we have the materials to make a spaceship to reach another galaxy? |
| 3065 | When was the very first dinosaur on Earth? |
| 3059 | Why can squirrels touch the telephone wires and not get electricuted? |
| 3056 | In Einstein's equation, E = mc2, he says that the energy released by an object is equal to the object's mass times
the speed of light squared. Why is the speed of light a factor in determining energy release? |
| 3055 | When a hermit crab leaves its shell that is too small, does it wander around without a shell until it finds another one, or does it go around with its shell till it finds a bigger empty one? |
| 3042 | Where does the chlorine from pools go when the water evaporates? Does this harm the ozone? |
| 3026 | How can a black hole suck things up if it doesn't really occupy any space? How do we know that space doesn't just end? |
| 3023 | How do scientists know there are such things as atoms? |
| 3011 | Why has no one been able to cultivate truffles? What separates them from other fungi? |
| 2989 | How is it that when powder is applied to a surface fingerprints appear? |
| 2975 | How do freshwater snails osmoregulate? I ask because I have been wondering why there are no freshwater squid. They would be a great fit for the estuaries. Please tell me how freshwater snails osmoregulate. |
| 2965 | Is there another solar system besides ours? |
| 2925 | How do bugs stick to the wall? |
| 2922 | What molecular property causes certain matter to be transparent? |
| 2913 | If an archeologist found a human tibia is it true that they can calculate the height of that particular person? |
| 2913 | How much does the population grow a minute? |
| 2910 | Why do migrating birds fly in that particular formation? |
| 2906 | How are plastics made into useful products? |
| 2892 | What causes the electron within an atom to emit photon packets? We were told to make a diagram of it. What causes the electron to skip down a level and emit photons? |
| 2882 | Why do certain events stay in your memory for a long time whereas others vanish quickly? How does you brain discriminate between them? |
| 2880 | Why is plasma classified as a phase? What is its chemical make-up? How was it discovered? |
| 2858 | What allows me to use my own voice inside my head to talk to myself? Like when you do math inside your head. How do we hear ourselves? With our brain? |
| 2857 | How many rocks are there on Earth? |
| 2854 | How are simple machines used in doorknobs? |
| 2844 | Where does water get its strength? |
| 2843 | Where are the crystals in the crystal radio? |
| 2821 | I would like to know why is it that most people like to finish off a meal with something sweet? Or is it just natural to balance savory and sweet? If so, why not the other way around? Is it purely from the gastronomic angle or that's the way our senses and palate are built? |
| 2817 | Why is space black? |
| 2815 | Why are evergreen trees green all year round? |
| 2779 | Why are the small computers of today faster than the big IBM computers of the past? |
| 2774 | Why are some musical instruments still made out of wood instead of using new types of materials like plastic? |
| 2767 | Why is it that when I look at one side of the spoon I see my reflection right side up, and when I turn the spoon over I see my reflection upside down? |
| 2766 | Why does glass weigh more than plastic? |
| 2766 | I've heard of the expression "once in a blue moon" and I was wondering what is a blue moon and what is the significance in this saying? |
| 2762 | What makes the weather change? |
| 2735 | Can candle wax become a gas? |
| 2688 | How come when you are riding in a bus, car, plane, or train, you don't feel like you are moving? You can move about the same as if you are on the ground. |
| 2686 | Why do some scientists believe Pluto is not a planet? The dictionary defines a planet as "A non-luminous celestial body illuminated by light from a star, such as the sun, around which it rotates." Doesn't Pluto meet these conditions? |
| 2678 | Do certain flavors actually make your mouth cooler? (Peppermint, Spearmint) |
| 2674 | What is the history of coding? |
| 2667 | Do mountains ever fall? |
| 2648 | How does CGI (like in the Matrix and the Hulk) work? |
| 2641 | How do lasers in machines work? |
| 2639 | What is the aurora borealis and why does it occur? |
| 2634 | Why does popcorn stick to your tongue or anything else that is damp? |
| 2625 | I am interested in becoming a scientist. What do I need to study to pursue this interest? |
| 2622 | What are clouds made of? |
| 2603 | What's the most dangerous animal in New York State? |
| 2587 | How is rubber made? |
| 2583 | What causes the Earth to rotate? |
| 2578 | Does the moon have earthquakes/moonquakes? |
| 2568 | How will electric shocks to a plant effect its growth? |
| 2564 | I've heard that due to the massive amount of empty space in and between atoms, people could walk through a brick wall. How true is this from a scientific point of view? |
| 2556 | How are spiders different from insects? How many species of spiders are there? How many different silks are there? |
| 2555 | We have been introduced to Bernoulli's principle, and have done little experiments to see how moving air can have less air pressure than still or slower moving air. We can understand that it is true for water and air, but why? |
| 2548 | The laws of thermodynamics teach that things in nature go from order to disorder but the theory of evolution teaches that well ordered creatures evolved from disordered ones. How can both be true? |
| 2545 | What happens at the absolute speed of zero? The earth is moving at some speed, the galaxy is moving at some speed. If you could stop all direction and speed, what would happen? |
| 2538 | Why are some lights called Halogen Lights? Do they contain elements from the Halogen group? |
| 2538 | Is jello an amorphous solid? If not, what is it? |
| 2534 | Why do baseballs fly farther in Coors Field in Colorado? |
| 2532 | How is mercury a liquid like substance, but it does not make anything wet? |
| 2530 | What would happen if I touched a cloud? |
| 2524 | Why are male robins more colorful than the female robins? |
| 2519 | How come ice skates slide over ice so easily when hydrogen bonds usually make things stick? |
| 2518 | How do some flowers respond to stimuli such as light? |
| 2517 | Why is the full moon bigger in some places than in others? |
| 2503 | Why is it you can see lightning as it goes through the air, but not a laser beam? |
| 2499 | In space, are solar panels being used for power? What about nuclear power? |
| 2498 | At what magnification on a microscope can you actually see animal cells and plant cells? |
| 2472 | Why don't explorers go to planets other than the moon? |
| 2465 | Archeologists dig backward in history the deeper they go. Where does all this extra earth material come from and will the planet get bigger and wider as eons pass? |
| 2464 | How are carbon nanotubes formed? Can they be positioned easily? How? |
| 2409 | Why does the earth revolve around the sun in an oval shaped orbit not in a round orbit? |
| 2406 | Can you genetically change organisms like bacteria to eat garbage? |
| 2381 | In biology, do you study about birds and find out what they eat and where they live and where they migrate? |
| 2378 | What makes gyroscopes in airplanes orient themselves correctly in any position? |
| 2362 | How do people know how to make electricity? |
| 2362 | What is the smallest amount of a substance that can still have color? |
| 2356 | What is the invasive zebra mussel doing to Cayuga Lake? Is it anything like what happened with the cichlids and nile perch in Victoria Lake? |
| 2349 | How do you find dinosaur bones? |
| 2349 | Is the Mars Rover powered solely by solar power? How long will the solar panels be able to power the rover? |
| 2309 | How are electromagnets used in simple telephones? |
| 2288 | What are the possibilities that there is another form of life in the universe? |
| 2279 | What was the longest time a tornado touched the earth and when was it? |
| 2278 | If water evaporates, then why do we have lakes, ponds, and oceans? |
| 2278 | When diamonds are put under a black light why do some glow and some don't? Do the real ones glow or is it the fake ones that glow, or are they all real and glow differently because of things like quality clairty, shape, cut, or things like that? |
| 2275 | What are mirages? |
| 2271 | Why does the color of tree leaves change? |
| 2270 | How do they measure how far away stars are? |
| 2264 | If someone would dig a huge hole and fill it in with water so that it was a lake, in 1,000 years would the lake have fish in it? |
| 2249 | If you put a balloon of oxygen into liquid nitrogen what would happen to the balloon? |
| 2248 | How does a sociologist apply the scientific method in the study of sociology? |
| 2246 | Why does wood turn to ashes in my fireplace? |
| 2239 | How do you believe the Earth and the universe originated? And how is your theory proven by science? |
| 2221 | I have heard of ways to get energy through the braking of a car. How does this work? |
| 2218 | How is it physically possible for a sneeze to efficiently clear out our sinuses? What happens during a sneeze? |
| 2183 | Are there rainbows when it snows? |
| 2172 | Why does Jupiter have a red spot? |
| 2149 | What causes certain sounds to be unique even though they are on the same frequency? |
| 2117 | Can you take a migratory bird and magnetize the compass paricles in its head so it can't tell where it's going? |
| 2115 | What is a shooting star? |
| 2115 | How do people think of the words we say? |
| 2114 | Why does light travel slower in different materials (glass, water, etc.)? Also, how have scientists slowed light to "walking speeds"? |
| 2091 | What is the string theory in Physics? |
| 2082 | Is it possible to raise a cloned limb from the body? |
| 2051 | Can you explain the darkening of glass by irradiation? I am working with a high school chemistry teacher who would like to be able to use some old glass samples in discussions of atomic structure. Some of the glass has been turned purple through exposure to Cobalt-60. |
| 2048 | We learned that plastics are being used as lights. Can any other ordinary products be developed in the same way? |
| 2037 | What kinds of plants are poisonous? |
| 2005 | What fuel will be used in future interstellar rockets? |
| 1976 | Have you or will you ever try to weigh a red blood cell? If so, how would you? |
| 1970 | How does gravity work? |
| 1950 | How many scales do fish normally have? |
| 1949 | What known effect does radar and mobile phone towers have on racing pigeons capabilities to home? |
| 1930 | Won't the non-use of chlorofluro-carbon (CFC's) do more harm than good? |
| 1929 | What kinds of elements are found in the oldest rocks? |
| 1927 | If fog is really just low clouds, why don't they appear billowy and poofy like clouds in the sky do? |
| 1903 | What further advances have scientists at Cornell made in the study of GMO's? |
| 1898 | Can you find vitamins in the ground? |
| 1872 | How is the milky way different from other galaxies? |
| 1851 | How does two-photon microscopy work? How do the resonance patterns create a photon with half the wavelength of the parent photons? |
| 1846 | Why is gold such a soft material compared to something like iron? |
| 1834 | Now that we are all recycling, what are some of the products that are made from recycled materials that we should be buying to complete the cycle? |
| 1830 | How do eye glasses improve a persons sight? |
| 1812 | Why isn't the shortest day of the year the coldest? |
| 1798 | When a star is dying and increases greatly in size, is it because the gravitational pull from the star cannot overcome the pressure of the gasses that make up the star to begin with? |
| 1773 | How many atoms are in a grain of sand? |
| 1771 | How can we manage our natural resources? Will they run out? |
| 1769 | What is ozone and what makes it? |
| 1766 | Does gravity get stronger nearer to the ground? If so by how much? |
| 1757 | How did scientists get the idea for light years? |
| 1750 | Why do people have stress? |
| 1750 | Does energy have mass? Does light have mass? |
| 1745 | Why are eyeballs wet? |
| 1711 | What is the lowest recorded manmade vacuum? What is the lowest recorded natural vacuum? With known physical restraints of the universe, what is the lowest vacuum pressure in theory? Is is possible for low pressures to break...chemical, atomic, particle bonds/interactions? If so, can you give examples at each level? |
| 1666 | Why is the United States one of the few countries that is not measuring in the Metric system despite being used in cars, soda, and film? |
| 1656 | What is a black hole and why does it suck in objects in space? |
| 1602 | Is a snail faster or slower than a slug? |
| 1590 | Do Praying Mantis' eat animals bigger than themselves? |
| 1576 | When lightning flashes, does one see the plasma or the electrical charge? |
| 1574 | What is the chemical make up of Canola oil? |
| 1524 | How do magnets work? |
| 1517 | How does a bumble bee know which flower it's already been to? |
| 1502 | Why does the light from a sodium lamp appear orange? |
| 1500 | What would cool down faster and turn to ice quicker: hot water in the freezer or cold water in the freezer? |
| 1465 | If you burn a liter of fuel in an internal combustion engine are the emissions the same weight as the weight of the original liter, if not why? |
| 1457 | What is the evolutionary reason for abstract thought, art and expression? |
| 1439 | Is a venus flytrap a producer or a consumer? |
| 1398 | How does water boil? Why are there bubbles and how does bubbling work? |
| 1380 | I understand lead was replaced by graphite in pencils. Was this because of lead's harmful effects or because of economic reasons that the lead was replaced? |
| 1373 | What happens to a hydrogen atom after it has come in contact with a flame - I know it "pops" but what happens to the actual atom - does it remain as a hydrogen atom? Does it form a new atom or compund or is it annihilated? |
| 1364 | In 1987, there was a supernova which was detected on earth by a burst of neutrinos and also by a flash of light coming from the exploding star. Einstein's relativity principle mandates that nothing can travel faster than the speed of light, so the light and the neutrinos should have reached earth at the same time. But instead, the neutrinos arrived first, followed 6 hours later by the light. What is the explanation of this? Does it mean that Einstein was wrong? |
| 1357 | What is color? I know that objects absorb some colors and reflect others. But why do objects absorb or reflect certain colors? What do you add to something to make it reflect a color? |
| 1345 | What causes lightning? |
| 1244 | How do scientists know what the Earth's inner core is made up of? |
| 1227 | Why are there different colors to lightning? |
| 1223 | I was under the impression that viscosity of a fluid, particularly motor oil, increases as heat is applied. What is viscosity and does it have a positive or negative temperature coefficient? |
| 1216 | How does light travel though space if atoms aren't close together? |
| 1215 | How does energy that is released as heat get reused? |
| 1201 | Why do trees get new rings every year? |
| 1184 | Why do people get that weird feeling in their stomachs when they go down a hill or ride a rollercoaster? |
| 1183 | Why do chinese water deer have canine teeth? |
| 1170 | If an object passes in front of a projector/point-source of light that illuminates a screen far away, it will cast a shadow on the screen. Now, if the object moves fast enough, and/or if the screen is far enough, the shadow will move much faster than the object, and at a certain speed of the object, the shadow will move faster than the speed of light. What would a bystander, or a camera, see? |
| 1145 | How do you make synthetic elements? |
| 1129 | How do scientists determine the viscosity of lava? |
| 1126 | What exactly is radiation and why is it harmful? What can it do to you? How is it made? |
| 1120 | How does a microphone work? |
| 1119 | My instructor told me that the wavelength of laser light is determined by the distance between the mirrors in the laser device. I say he is not correct, it is the nature of the lasing medium itself as the molecules that make it up emit characteristic wavelenghts when excited. Which of us is correct? |
| 1101 | How is a language invented? |
| 1086 | How does wind affect waves? |
| 1033 | How are radioisotopes used to battle cancer cells? |
| 1033 | Why do some bugs jump? |
| 1025 | Can an infrared beam conduct an electrical current? |
| 1013 | How do sea turtles find their way back to the same beach they were born on after traveling all through the sea? |
| 998 | Why is a dandelion stem like a straw (hollow)? |
| 990 | If radioactive elements are getting converted into half in each of their successive half lives, then are radioactive elements going to disappear from universe after certain amount of time? |
| 980 | How does the atomic clock work? I know it has something to do with the element cesium, but how does it "know" the "right" time to the exact second? |
| 980 | Why does the sky turn red or orange when the sunsets? Why does it turn grey during a storm? |
| 970 | Does the universe have an edge? |
| 967 | Why is it that when fruit ripens, it gets sweeter than when it's picked? Is there more sugar in it? |
| 964 | Is there an accurate way to measure how much the planet earth weighs? If it's possible how much does the earth weigh ? |
| 952 | If photons have no mass, and you can make an atom laser, instead of an optical one. Would it be possible to attach matter or a small machine to a beem of light and make it travel long distances at light speed? |
| 952 | Can you please tell me what exactly nanobiotechnology is. Also, does it have a future? Or will it greatly effect the future and will nanobiotechnology be one of the leading areas of research? |
| 948 | How do wings on birds make them fly? |
| 941 | How does a mass spectrometer separate isotopes? |
| 933 | Is the universe expanding? Why or why not? What theories have been used to prove or disprove this phenomenon? |
| 918 | Why are dipole-dipole and London-Dispersion Forces so much weaker than hydron bonds? Why are intermolecular forces weaker than atomic bonds? |
| 917 | How do you grow taller? |
| 902 | Why do solar cells produce more electricity in low temperatures? |
| 892 | Why do we have nightmares/night terrors? How long do they normally last? |
| 892 | Why do scuba divers wear rubber? |
| 886 | What exactly are isotopes? I know that an element with different proton and neutrons is an isotope. So would it mean that (for example) Barium is an isotope but Aluminum is not? |
| 886 | What are computers going to look like in the future? |
| 876 | What are electromagnets and what metals are included? |
| 870 | In an empty charged sphere, even though the charge is evenly distributed on the surface, why does it behave as if it is all in the center? (The same as gravity) |
| 860 | Why don't sharks have bones? |
| 859 | I've always been puzzled by the way celestial bodies orbiting one another tend to "line up" on a roughly two-dimensional plane. Take the Solar System, for example: in all of the illustrations or moving simulations of planetary orbits I have seen, the planets always align themselves along roughly the same horizontal axis, with only slight vertical variation in their respective orbits. Is this phenomenon of "horizontal alignment" a result of the gravity of all the planets / moons / rings kind of pulling each other together even while they are all orbiting the same sun / planet? Was there an earlier time in the history of the solar system or of individual planets where there was a greater disparity between the horizontal alignments of different orbiting bodies? Or have I just been seeing simplified illustrations that don't accurately reflect all three dimensions in which bodies orbit other celestial bodies? |
| 856 | How long ago were fiber optics developed? |
| 853 | Why is it possible for some animals to hear certain frequency pitches of sound and why others can't. What is different about their ears? |
| 852 | How come a lot of colors make the black found in black markers? |
| 833 | What is the difference between fuels (Diesel, unleaded, etc.)? |
| 826 | If a person stands on a circular rotating stand, facing away from the centre with arms outstretched holding a spinning bicycle wheel and tilts the wheel to once side this causes the stand they are standing on to rotate. My questions are:
Why is this?
Does it make a difference which way the bicycle wheel is spinning?
Will the bicycle wheel's momentum be effected by the spin of the stand the person is stood on?
For the strongest anti-clockwise pull on the stand should the wheel be angled by raising the right hand and lowering the left(tilting), or pushing forward the right hand and drawing back the left (turning). |
| 819 | How does the wind blow? |
| 817 | How do spaceships work? |
| 810 | Do trees have leaf "pores" where the leaves grow back every year in the same place, or do leaves grow back in different spots along a branch? |
| 784 | How much progress are scientists making in finding an enzyme that will degrade plastic to something environmentally friendly that can be safely reintroduced to the earth around us? |
| 766 | Why is the pressure required for a bicycle tire so much higher than the pressure for a car tire? How come the much smaller bike tire does not explode when filled with such high pressure? |
| 744 | I am currently studying electronics and how they work together to perform work. But I seem to get confused when the term "ground" is used. I understand that it is a "zero" reference point, and that it is a common return path for electrons to earth ground. I get stumped though when I see a schematic that has a ground attached to the negative end of a battery terminal in a dc circuit. Why don't the electrons just flow straight to ground? Then in an AC circuit schematic, I see a ground connection again connected to the negative side of a circuit. Can I assume that the ground is positively polarized which attracts the electrons? |
| 736 | Is the human eye like a fingerprint? Can it be used for positive identification purposes? |
| 731 | Who was the first scientist in the whole entire world. What experiment did he/she do? |
| 724 | Why does oil float above water? |
| 723 | What are a few, most effective, things we can do to protect our body's cells from becoming cancerous? |
| 716 | How do planets form? |
| 690 | Can you create protons? And if not, where did the hydrogen nuclei required to form a star come from? |
| 683 | We've heard that bats can glide but not soar, and we've also heard that they can't glide or soar... only fly by flapping. Can you clear this up for us? (We're asking because, in the summertime when we look up, we're not always sure whether we're seeing are swallows or bats at dusk, and this would help.) |
| 669 | If we had to leave earth, what would be the best planet to move to? Which one would be most like Earth? |
| 647 | Why are coral reefs dying? |
| 639 | What forces make a volcano erupt? |
| 639 | What types of body chemicals are involved in depression? Has anyone done research on a possible connection between negative blood types and depression? |
| 556 | What causes a tsunami? |
| 547 | Why does hot air go up and cold air go down? |
| 528 | Why is type O blood the most abundant type when it is recessive? |
| 520 | Why do baseball bats sting you when you hit a baseball? |
| 498 | How is hail produced? |
| 483 | What was the biggest shark that scientsts found in the ocean? |
| 443 | Why are the boiling points of metals with metallic bonds so varied? |
| 409 | What causes a tidal wave? |
| 400 | What is heat lightning and how is it possible? Is it different from lightning during a storm? If so, how? |
| 395 | Why do scuba divers wear rubber? |
| 356 | Does temperature effect the speed of light? |
| 309 | Why do scientists say Pluto should not be a planet? |
| 295 | Since there is no air on the moon, why is the United States flag waving around when you see footage of man on the moon? |
| 278 | Why does water boil at a lower temperature in Denver (higher altitude) than in New York? |
| 235 | How do scientists detect and measure seismic waves? |
| 224 | Have we ever observed a newborn star "turn on"? Or, is the process of self-sustaining nuclear fusion so gradual that the increase in luminosity of newborn stars is not noticeable in a human lifespan? |
| 203 | How do speakers produce more than one sound at a time (example: guitar and vocal)? |
| 198 | Where have most dinosaur bones been found? Where have the most dinosaur eggs been found? |
| 173 | How do mutations occur? Do they risk life? |
| 149 | Can particle accelerators accurately simulate conditions that occured during the Big Bang? |
| 136 | What is nanotechnology? |
