There are about 1,400 different species of bacteria in your belly button.
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There's 100 trillion good bacteria living in your body.
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In one day, adult lungs move about 10,000 litres of air.
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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.
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The average person's skin weighs twice as much as their brain.
131
Held in farts enter your bloodstream and are bad for your body.
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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
There are glasses which allow a red-green color-blind person to see colors the way everyone else does.
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