An unprotected human can survive up to 1.5 minutes in space with no permanent bodily damage.
82
The average sperm cell swims at 8 inches per hour.
4
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Enamel is hardest substance in the human body.
61
A man's beard grows fastest when he anticipates sex.
239
Gorillas can catch human colds and other illnesses.
205
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
34