HEATKEYS

Complete, up-to-date, mineral database containing 4,714 mineral species descriptions and comprehensive picture library of images. These data are linked to mineral tables by crystallography, chemical composition, physical and optical properties, Dana ...

Chemistry is the study of matter and energy and the interactions between them. Get facts for the elements in the periodic table. Find chemistry demonstrations and experiments and science fair projects. Get chemistry homework help with worked example ...

Online Dictionary - Multiple dictionaries including: English dictionary, medical dictionary, legal dictionary, financial dictionary, computer dictionary, thesaurus, dictionary of acronyms and abbreviations, dictionary of idioms, thesaurus, Columbia e...

ChemSpider is a free chemical structure database providing fast access to over 26 million structures, properties and associated information.

This site is intended for students age 14 and up, and for anyone interested in learning about our universe.

Get homework help from CliffsNotes literature notes and study guides, covering literature, Shakespeare, biology, chemistry, math, calculus, history, and much more.

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

Features hundreds of credible pros and cons including scientific marijuana research and expert opinions on medical cannabis