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Did you know?
Illicit drug use costs the United States approximately $181 billion every year.
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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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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
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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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The familiar sounds of your heart are made by the heart's valves as they open and close.