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IB Guides, free International Baccalaureate study resources.

Breaking science news and articles on global warming, extrasolar planets, stem cells, bird flu, autism, nanotechnology, dinosaurs, evolution -- the latest discoveries in astronomy, anthropology, biology, chemistry, climate & environment, computer...

YouTube is a place to discover, watch, upload and share videos.

Medical Dictionary is intended for use by healthcare consumers, students, and professionals as well as anyone who wants to keep up with the burgeoning array of terminology found in today’s medical news. By staying clear of jargon, the dictionary o...

More than 1800 Biology questions and answers to help you study all subjects.

Biology: A-Ar, Ar-Bi, Bl-Ce, Ce-Co, Co-Dn, Dn-Ep, Ep-Fl, Fo-Gr, Gr-Hi, Ho-La, La-Ma, Ma-Mo, Mo-Nu, Oc-Ph, Ph-Po, Po-Re, Re-Se, Se-T, Ta-Va, and Ve-Z

Explore the updated online encyclopedia from Encyclopaedia Britannica with hundreds of thousands of articles, biographies, videos, images, and web sites.

Providing researchers with access to millions of scientific documents from journals, books, series, protocols and reference works.

The Molecular Expressions website features hundreds of photomicrographs (photographs through the microscope) of everything from superconductors and high-tech materials to ice cream and beer.