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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 stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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The human body produces and destroys 15 million blood cells every second.
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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.