It takes about 20 seconds for a red blood cell to circle the whole body.
102
The adult human brain weighs about 3 pounds (1,300-1,400 g).
99
We forget why we have entered a room because passing through doors creates an ‘event boundary’ causing the brain to file away what we were just thinking about.
26
A human being loses an average of 40 to 100 strands of hair a day.
133
The world's shortest man measures only 21.5 inches.
73
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11
Poor eyesight (myopia) is associated with higher IQ.
232
Your fingernails grow faster in summer.
744