It takes about 20 seconds for a red blood cell to circle the whole body.
102
On average, a human being will have sex more than 3,000 times and spend two weeks kissing in their lifetime.
161
Your thumb is about the same size as your nose.
124
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
Your fingernails grow faster in summer.
744
Mushrooms are more closely related to humans than they are to plants.
47
Only humans shed emotional tears.
331
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127