Ask a Scientist connects you to some of the top scientists in the country, and each of them is connected to the Howard Hughes Medical Institute. If you've got a question about medicine, human biology, animals, biochemistry, microbiology, genetics,
or evolution, then please,
Ask a Scientist!

Why is there no mammal with green fur? Green is a good camouflage color, and nonmammals (for example, frogs, snakes, and birds) do come in green. Why not mammals?
Andrew Tan was in eighth grade when he first pulled his father's copy of Gödel, Escher, Bach from the bookshelf next to the TV. He was entranced by the optical illusion known as the Penrose triangle on the cover, but he was even more intere ...