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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Your heart beats over 36 million times a year.
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ACTH levels are normally highest in the early morning (between 6 and 8 A.M.) and lowest in the evening (between 6 and 11 P.M.). Therefore, a doctor who suspects abnormal levels looks for low ACTH in the morning and high ACTH in the evening.