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About "Ask A Scientist!"
On September 17th, 1998 the Ithaca Journal ran its first "Ask A Scientist!" article in which Professor Neil Ashcroft , who was then the director of CCMR, answered the question "What is Jupiter made of?" Since then, we have received over 1,000 questions from students and adults from all over the world. Select questions are answered weekly and published in the Ithaca Journal and on our web site. "Ask A Scientist!" reaches more than 21,000 Central New York residents through the Ithaca Journal and countless others around the world throught the "Ask a Scientist!" web site.
Across disciplines and across the state, from Nobel Prize winning scientist David Lee to notable science education advocate Bill Nye, researchers and scientists have been called on to respond to these questions. For more than seven years, kids - and a few adults - have been submitting their queries to find out the answer to life's everyday questions.
As long as you are alive, you will have the same proportion of carbon 14 to other carbon as exists in other living organisms, but when you die, the radioactive carbon in your body begins to decay at a known rate. After about 5730 years, only half of the original radioactive carbon is left. Practically no carbon 14 remains after 50,000 years have gone by.
This means that carbon dating can only be used to date things that existed 50,000 years ago or less. It wouldn't be of any help in dating a dinosaur, for instance, because the last dinosaurs went extinct about 65 million years ago. Carbon dating was useful, though, to Cornell researchers and students who excavated some extinct woolly mammoths near Watkins Glen in central New York State; they determined that the mammoths lived at the end of the last Ice Age, some 12,000 years ago.
Although carbon dating can be done on a variety of materials, including bones of ancient people and other animals, it often works best on items that are essentially pure carbon, such as charcoal from wood fires. Radiocarbon dating of burnt plants has helped archaeologists trace the origins and spread of agriculture in many parts of the world.
In the past, scientists used equipment, such as Geiger counters, to detect and count the decay of individual atoms of carbon 14. Now they can also use atomic accelerators to find the amount of carbon 14 in a sample without having to wait for decay events. This allows the scientists to quickly date very small amounts of material, such as individual seeds.
More information on the history, uses, methods and problems of carbon dating can be found on the web at: www.c14dating.com
- How are submarines able to go down so deep under the water, and then surface?
- How does a particle accelerator work and why is it so useful?
- 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?
- Why does each snowflake have a different shape?
- 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?
- Why do boomerangs come back when you throw them?
- 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?
- What is the string theory in Physics?
- Why is there discussion as to whether or not glass is a liquid or a solid?
- 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?