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
In one day, adult lungs move about 10,000 litres of air.
11
The human sigh acts as a physiological reset button.
23
Within three days of death, the enzymes that once digested your food begin to eat you.
22
The human brain doesn't stop developing until about 25 years old.
102
There's 100 trillion good bacteria living in your body.
17
Our eyes are always the same size from birth, but our nose and ears never stop growing.
266
In Ancient Greece, small penises were desirable, and big ones were for ‘old men and barbarians’
22