It has been scientifically proven that stroking a cat can lower one's blood pressure!
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You can't tickle yourself.
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An average heart beats 100,000 times a day, pumping some 2,000 gallons of blood through its chambers. Over a 70-year life span, that adds up to more than 2.5 billion heartbeats.
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Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
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The human eye blinks an average of 4,200,000 times a year.
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A human being loses an average of 40 to 100 strands of hair a day.
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In one day, adult lungs move about 10,000 litres of air.
11
It took 200,000 years for humans to reach 3 billion in number. It took 40 years for the next 3 billion.
11