The human brain doesn't stop developing until about 25 years old.
102
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The average person's skin weighs twice as much as their brain.
131
Yawns are more contagious among people with closer relationships.
163
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
The average sperm cell swims at 8 inches per hour.
4