Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.
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Certain rare plants containing cyanide include apricot pits and a type of potato called cassava. Fortunately, only chronic or massive ingestion of any of these plants can lead to serious poisoning.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
Not You're Typical Apple
Apple
Apple iPhone 3G, as displayed in Toronto.
A slave market in Marrakesh, Morocco. This lithograph is from the 1800s.