The focusing muscles of the eyes move around 100,000 times a day. To give your leg muscles the same workout, you would need to walk 80km (50 miles) every day.
21
It takes about 20 seconds for a red blood cell to circle the whole body.
102
Men get hiccups more often than women.
93
In older people, memory is best early in the morning and then declines during the late afternoon.
33
The human brain doesn't stop developing until about 25 years old.
102
When you fall in love, that 'high' feeling is caused by a flood of dopamine that is similar to that of cocaine.
44
Fingernails grow fastest on the hand you favor.
44
A person can live without food for about a month, but only about a week without water.
156