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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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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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The human body produces and destroys 15 million blood cells every second.