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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.
Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.