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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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Acute bronchitis is an inflammation of the breathing tubes (bronchi), which causes increased mucus production and other changes. It is usually caused by bacteria or viruses, can be serious in people who have pulmonary or cardiac diseases, and can lead to pneumonia.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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It is widely believed that giving a daily oral dose of aspirin to heart attack patients improves their chances of survival because the aspirin blocks the formation of new blood clots.