On average a woman has 4 sexual partners in her lifetime.
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After age 30, the brain shrinks a quarter of a percent (0.25%) in mass each year.
139
The average sperm cell swims at 8 inches per hour.
4
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
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Early American humans hunted car-size armadillos and used their shells for houses.
12
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
A third of the human population sneezes when they look at the Sun. Light can signal the ocular nerve near the sinuses and triggers a sneeze.
18