Your fingernails grow faster in summer.
744
Only 12,000 years ago there was a species closely related to modern humans called Homo floresiensis that had been living on an Indonesian Island. They used fire and rather advanced tools, yet were only about 3 feet tall and weighed around 25kg.
15
Only humans shed emotional tears.
331
Your heart will pump about 212 million liters in its lifetime.
26
By weight, Bone is five times stronger than steel.
417
Fingers prune underwater not because of them absorbing the water or washing away the oil, but because of an evolutionary trait caused by the brain to enhance the grip of your fingers underwater.
24
The average sperm cell swims at 8 inches per hour.
4
It has been scientifically proven that stroking a cat can lower one's blood pressure!
456