A person will create enough saliva to fill two average size swimming pools during his lifetime.
191
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Only humans shed emotional tears.
331
It takes approximately 12 hours for food to entirely digest.
93
Modern humans first appeared about 200,000 years ago, but record keeping didn't begin until about 6,000 years ago. That means about 97% of human history is lost.
21
Shark corneas are used in eye transplants and shark bone marrow can be used to graft human bones.
132
If your DNA was stretched out it would reach to the moon 6,000 times.
256