Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
The average sperm cell swims at 8 inches per hour.
4
You forget 90% of your dreams.
256
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
The human brain is more active during sleep than during the day.
28
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456
By weight, Bone is five times stronger than steel.
417