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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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Your heart beats over 36 million times a year.
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The horizontal fraction bar was introduced by the Arabs.
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The oldest recorded age was 122. Madame Jeanne Calment was born in France in 1875 and died in 1997. She was a vegetarian and loved olive oil, port wine, and chocolate.