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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Asthma occurs in one in 11 children and in one in 12 adults. African Americans and Latinos have a higher risk for developing asthma than other groups.
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The longest a person has survived after a heart transplant is 24 years.
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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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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.