In one day, adult lungs move about 10,000 litres of air.
11
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
All humans have the ability to see ultraviolet light, but it is passively filtered out by the eye's lens. People who undergo surgery to remove the lens can detect ultraviolet light.
22
There's 100 trillion good bacteria living in your body.
17
The human sigh acts as a physiological reset button.
23
It takes twice as long to lose new muscle if you stop working out than it did to gain it.
127
There are about 1,400 different species of bacteria in your belly button.
10
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118