It takes about 20 seconds for a red blood cell to circle the whole body.
102
Cats have a weak sense of taste. They have only 473 tastebuds, humans have 9,000.
307
The human brain is more active during sleep than during the day.
28
If the human eye was a digital camera, it would have 576 megapixels.
25
The human brain uses approximately as much energy as a 10 watt light bulb.
120
A person can live without food for about a month, but only about a week without water.
156
A human being loses an average of 40 to 100 strands of hair a day.
133
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