Your fingernails grow faster in summer.
744
If Earth's life was compressed into 1 year, then humans would have been around for only 2 seconds.
15
Early American humans hunted car-size armadillos and used their shells for houses.
12
Every human spent about half an hour as a single cell.
144
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
The human brain is more active during sleep than during the day.
28
It is possible for you to survive even after the removal of the spleen, the stomach, one kidney, one lung, 75% of the liver, 80% of the intestines, and almost every organ from the pelvic and groin area.
218
The average sperm cell swims at 8 inches per hour.
4