13.It would take 1,200,000 mosquitoes, each sucking once, to completely drain the average human of blood.
14.Written language was invented independently by the Egyptians, Sumerians, Chinese, and Mayans.
15.To know when to mate, a male giraffe will continuously headbutt the female in the bladder until she urinates. The male then tastes the pee and that helps it determine whether the female is ovulating.
16.It can take a photon 40,000 years to travel from the core of the sun to the surface, but only 8 minutes to travel the rest of the way to earth.
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