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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.
If all the neurons in the human body were lined up, they would stretch more than 600 miles.
Ether was used widely for surgeries but became less popular because of its flammability and its tendency to cause vomiting. In England, it was quickly replaced by chloroform, but this agent caused many deaths and lost popularity.
Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.