Mushrooms are more closely related to humans than they are to plants.
47
After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
Early American humans hunted car-size armadillos and used their shells for houses.
12
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
One human hair can support 3 ounces.
191
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Research has determined that most people are happiest at 7:26pm on a Saturday night.
69