Your fingernails grow faster in summer.
744
Early American humans hunted car-size armadillos and used their shells for houses.
12
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307