One human hair can support 3 ounces.
191
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
A human brain produces as many as 12,000 to 50,000 thoughts per day, depending on how deep a thinker a person is.
23
Tigers can see 6 times better at night than humans.
305
Pet dogs and elephants are the only animals that seem to instinctively understand human gesture.
14
Every human spent about half an hour as a single cell.
144
On average, there's 100 billion neurons in the human brain.
83