Yawns are more contagious among people with closer relationships.
163
The human brain has the capacity to store everything that you experience.
4k
One human hair can support 3 ounces.
191
The average sperm cell swims at 8 inches per hour.
76
When you take a step, you are using up to 200 muscles.
886
If you are cold you are more likely to be hungry because you use energy to keep warm.
143
Women have about four times as many foot problems as men; lifelong patterns of wearing high heels often are the culprit.
111