It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Your heart will pump about 212 million liters in its lifetime.
26
Mushrooms are more closely related to humans than they are to plants.
47
The world's shortest man measures only 21.5 inches.
73
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
Every human spent about half an hour as a single cell.
144
When you kiss someone for the first time, you get a spike in the neurotransmitter dopamine, making you crave more.
23
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307