A blind American man taught himself to navigate using echolocation. His hobbies include hiking and mountain-biking, and he has now trained over 500 students in his ‘tongue-click’ technique.
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A monk had once written over a book that contained information about calculus that was written by Archimedes in ancient Greece that could have made us 100 or even 1000 years more mathematically and technologically advanced.
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The Sun and Moon appear to be the same size because the moon is 400 times smaller than the Sun, but 400 times closer to Earth.
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The oldest living person smoked cigarettes from the age of 21 to 117.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
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If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
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In their early careers, Sylvester Stallone and Jackie Chan both took part in porn.
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It has been estimated that a bite from a grizzly bear can crush a bowling ball.
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