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More than 150,000 Americans killed by cardiovascular disease are younger than the age of 65 years.
The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
Normal urine is sterile. It contains fluids, salts, and waste products. It is free of bacteria, viruses, and fungi.
There are more sensory neurons in the tongue than in any other part of the body.
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.