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!
A list of questions and answers by category are listed. For example, what is the difference between stem cells generated from an 8-celled embryo and cells from an inner cell mass? (part answer: the inner cells give rise to an entire embryo). Or, how can scientists tell the difference between fresh and salt-water fossils? (One answer is to determine isotopes of oxygen). How can scientists tell whether fossil bones came from a dinosaur or some other animal? (mainly shape and size). Did fire-breathing dragons ever exist? The web page has sections also on science fair projects, homework help, personal health, and science careers.
Howard Hughes Medical Institute
4000 Jones Bridge Road
Chevy Chase MD 20815