The average sperm cell swims at 8 inches per hour.
76
When you take a step, you are using up to 200 muscles.
885
Poor eyesight (myopia) is associated with higher IQ.
232
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Cracking your knuckles does not actually hurt your bones or cause arthritis. The sound you hear is just gas bubbles bursting.
18
If you are cold you are more likely to be hungry because you use energy to keep warm.
144
Yawns are more contagious among people with closer relationships.
163
The human brain doesn't stop developing until about 25 years old.
102