Tigers can see 6 times better at night than humans.
305
A human being loses an average of 40 to 100 strands of hair a day.
133
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
A man's beard grows fastest when he anticipates sex.
239
In one day, adult lungs move about 10,000 litres of air.
11
The human sigh acts as a physiological reset button.
23
It takes about 20 seconds for a red blood cell to circle the whole body.
102
The average sperm cell swims at 8 inches per hour.
4