There are about 1,400 different species of bacteria in your belly button.
10
In one day, adult lungs move about 10,000 litres of air.
11
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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The human sigh acts as a physiological reset button.
23
The average person's skin weighs twice as much as their brain.
131
Your body is creating and killing about 2.4 million red blood cells per second.
17
The brain receives 20% of the body’s oxygen and 25% of total body glucose utilization, despite it accounting for only 2% of a person’s weight (about 1.4 kilograms).
8
You can hear the blood flowing through your ears if you find a quiet place and cover them tightly.
19