This dictionary of science is designed to be of interest to the non-specialist as well as for the scientist and science student. Compiled by a team of consultant editors, this book covers topics from astronomy to zoology, explaining and illustrating the basic terms in language that does not assume formal scientific training. Complementing the text are a unique set of feature articles compiled by experts in their field, posing answers to such questions as - how many fundamental particles remain to be discovered, is a cure for AIDS in sight and is it worth preserving endangered species?