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Vaccines prevent between 2.5 and 4 million deaths every year.
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People who have myopia, or nearsightedness, are not able to see objects at a distance but only up close. It occurs when the cornea is either curved too steeply, the eye is too long, or both. This condition is progressive and worsens with time. More than 100 million people in the United States are nearsighted, but only 20% of those are born with the condition. Diet, eye exercise, drug therapy, and corrective lenses can all help manage nearsightedness.
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The first documented use of surgical anesthesia in the United States was in Connecticut in 1844.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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The average adult has about 21 square feet of skin.