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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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More than 4.4billion prescriptions were dispensed within the United States in 2016.
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Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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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.