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Health
Stats and facts about personal health, nutrition, fitness, disease, mortality, health insurance, H1N1, drug and alcohol use, and more
Weather
Learn about meteorology; climate; weather disasters, including hurricanes, tornadoes, and lightning; extreme temperatures and precipitation, and more
Astronomy
A primer on the universe, astronomical measurements, details about the solar system, and NASA
Space
Details, slideshows, and timelines about space exploration
Aviation
Aviation records, Amelia Earhart's legacy, famous aircraft, the Wright brothers, milestones in aviation
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Science & Inventions
Cloning, interactive periodic table, the chemical elements, table of geological periods, timeline of famous inventions
Weights & Measures
Conversion calculator, the metric system, U.S. customary system, currency converter, cooking measurement equivalents, sports measurements
Math & Money
Primer on cardinal, ordinal, and nominal numbers, formulas, square roots, powers, numeric operations, U.S. currency, facts about money
Computer & Internet
Recommended video games, info on game ratings, statistics on computer and internet use, data on cell phone use, and more
Environment & Nature
Information about air pollutants, global warming, the greenhouse effect, world and U.S. energy consumption, oil reserves, animals, plants, and endangered species
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Atlas
Encyclopedia
Dictionary
Thesaurus
Day in History
