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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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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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The highest suicide rate in the United States is among people ages 65 years and older. Almost 15% of people in this age group commit suicide every year.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.