Yawns are more contagious among people with closer relationships.
163
The human brain doesn't stop developing until about 25 years old.
102
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
A human being loses an average of 40 to 100 strands of hair a day.
133
Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
A man's beard grows fastest when he anticipates sex.
239
Having sex can make a woman look younger and more attractive due to the release of estrogen and collagen.
346
You forget 90% of your dreams.
256