It takes about 20 seconds for a red blood cell to circle the whole body.
102
Your fingernails grow faster in summer.
744
Only humans shed emotional tears.
331
Pain occurs when sounds are above 130 db.
124
In 30 minutes, the average body gives off enough heat (combined) to bring a half gallon of water to boil.
198
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127