HEATKEYS

THE starting place for exploring Geography, from your About.com expert Guide to geography. Learn about all concepts of geography, find geographic information, maps, and more. Includes geographic information about every country and state as well as ...

Online weights and measures conversion. Online calculators for quick and easy metric conversion, conversion tables for both commonly used and very exotic units.

Metric Conversion calculators, tables and formulas for temperature, length, area, volume and weight metric conversions.

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NOAA

Online Conversion is a resource for weights, measures, calculators, converters.

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...

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

This site includes lots of information that is time and date related, such as yearly and monthly calendars, countdown counters and the world clock which shows current time in cities all over the world.

Physical Measurement Laboratory Homepage

Infoplease.com, a free, authoritative, and respected reference for Internet users, provides a comprehensive encyclopedia, almanac, atlas, dictionary, and thesaurus. Infoplease.com contains facts on all subjects including sports, entertainment, techno...