It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Early American humans hunted car-size armadillos and used their shells for houses.
12
Yawns are more contagious among people with closer relationships.
163
Every human spent about half an hour as a single cell.
144
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Babies crawl an average of 200m a day.
212
The largest cell in the human body is the female egg and the smallest is the male sperm.
682
Mushrooms are more closely related to humans than they are to plants.
47