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
You see your nose at all times, your brain just chooses to ignore it.
30
If you hold farts in during the day, they'll just come out when you sleep.
16
The average sperm cell swims at 8 inches per hour.
76
The human body contains over a billion miles of DNA.
147