Yawns are more contagious among people with closer relationships.
163
The average person's skin weighs twice as much as their brain.
131
By weight, Bone is five times stronger than steel.
417
A human being loses an average of 40 to 100 strands of hair a day.
133
You forget 90% of your dreams.
256
The human brain is more active during sleep than during the day.
28
Gorillas can catch human colds and other illnesses.
205
Only humans shed emotional tears.
331