The world's shortest man measures only 21.5 inches.
73
Coughing can cause air to move through your windpipe faster than the speed of sound - over a thousand feet per second!
197
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
Most of us have microscopic, worm like mites named Demodex that live in our eyelashes and have claws and a mouth.
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The average sperm cell swims at 8 inches per hour.
4
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Enamel is hardest substance in the human body.
61
A human being loses an average of 40 to 100 strands of hair a day.
133