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 single speck of dust is half way in size between a subatomic particle and the Earth.
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Ernest Vincent Wright wrote a 50,000 word book titled 'Gadsby' which did not use the letter "e".
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In 1976, an underachieving Princeton junior undergraduate wrote a term paper detailing how to make a nuclear bomb. He got an "A", but never got his paper back because it was seized by the FBI.
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Blue whale arteries are large enough for humans to swim through and their hearts are the size of cars.
12
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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