A person can live without food for about a month, but only about a week without water.
156
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
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19
If your DNA was stretched out it would reach to the moon 6,000 times.
256
The human brain uses approximately as much energy as a 10 watt light bulb.
120
In one day, adult lungs move about 10,000 litres of air.
11