Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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Sound travels about 4 times faster in water than in air.
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In zero gravity, a candle's flame is round and blue.
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Approximately 70 percent of the earth is covered by water. Only 1 percent of this water is drinkable.
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Oak trees produce 2,200 acorns in a season, but each acorn only has a 1 in 10,000 chance of becoming an oak tree.
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Optical illusions occur when what the eyes see conflicts with what the brain expects.
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In the 60s, a scientist gave LSD to dolphins in an attempt to teach them English.
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In 1999, Harvard physicist Lene Hau was able to slow down light to 17 meters per second and in 2001, was able to stop light completely.
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