Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
In zero gravity, a candle's flame is round and blue.
16
There are more than 270 people cryogenically frozen in the hope that one day the technology will exist that can revive them and extend their lives.
13
The hair of an adult man or woman can stretch 25 percent of its length without breaking.
116
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
Hot water can freeze faster than cold water.
181
Each day, up to 150 species of life become extinct.
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