It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
There are about 255 babies born worldwide every minute.
46
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Only humans shed emotional tears.
331
Humans are capable of running 40 mph according to a study by bio-mechanical expert Dr. Matthew Bundle. Today's fastest man, Usain Bolt, has a top speed of 28 mph.
35
If the human eye was a digital camera, it would have 576 megapixels.
25
One human hair can support 3 ounces.
191