Archives of Ask A Scientist!
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.
In order to have color vision, the retina in the back of the eye must have color detectors, called cones, present and the brain has to be wired to make use of the information it gets from the cones. We have three different kinds of cones in our eyes, called red, green and blue that make human color vision possible. The goldfish has four kinds of cones: red, green, blue and ultraviolet. Other fish have different numbers and kinds of cones meaning that they have the capability of seeing in color. However, simply finding cones in the eye does not mean that an animal has color vision. You have to test it behaviorally to see if it can tell one color from another. For example, I could set up a tank with two windows at one end whose color I could change. I would start by making one window gray, that is having no color, and the other red. Whenever the fish went to the red window I would give it some food. I would change the brightness of the gray and red windows to make sure that the fish was training to only color. As soon as the fish had learned to associate red with food, I would start to replace the gray with other colors and see if the fish still only went to the red. This would be repeated for lots of different color combinations. If the fish remained true to its trained color, than it would be said to have color vision. To date, this kind of testing has only been done for a few kinds of fish. However, I am confident that as we test many more kinds of fish we will find color vision to be very common.
- How do chameleons/anoles change colors?
- Why do birds bob their head when they walk?
- Why can't we swallow our food whole like snakes?
- Why are male robins more colorful than the female robins?
- What does a flying fish do to fly?
- Can there be hummingbirds in Croatia?
- Why do dolphins live in the water when they are mammals?
- 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?
- Why can't fish breathe on land?
- Why do turtles have shells?