There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
22
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
The human brain is very soft, having a consistency similar to soft gelatin or firm tofu.
13
In one day, adult lungs move about 10,000 litres of air.
11
One human hair can support 3 ounces.
191
The human sigh acts as a physiological reset button.
23
Oxygen, carbon, hydrogen and nitrogen make up 90% of the human body.
118
