HowStuffWorks Science has explanations and colorful illustrations related to earth science, life science, and other wonders of the physical world.

polishing laps, precious stones, gemstones, lapidary equipment, lapidaries, jewelry supplies, jewelry, stone cutters

Pratt & Whitney is a world leader in the design, manufacture and service of aircraft engines, space propulsion systems and industrial gas turbines.

Science, astronomy, and space flight news, science and renewable energy encyclopedias. Maintained by science writer David Darling, Ph.D.

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 encyclopedia, Wikipedia encyclopedia, Hutchinson encyclopedia, examples from classic literature, pronunciations, word browser, glossary. Free access

Browse through a selection of airplane photographs from the beginning of aviation history to the present day. Take a virtual tour of the Garber restoration facility, where historic aircraft are refurbished before being put on display in museums. This site offers technical specifications and histories of airplanes from around the world.