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More than 20 million Americans cite use of marijuana within the past 30 days, according to the National Survey on Drug Use and Health (NSDUH). More than 8 million admit to using it almost every day.

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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

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Most women experience menopause in their 50s. However, in 1994, an Italian woman gave birth to a baby boy when she was 61 years old.

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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

Examining Retinal Structures, Fundoscopic Examination Examining Retinal Structures, Fundoscopic Examination
Areas of Referred Pain, Anterior View Areas of Referred Pain, Anterior View
Examination of the interior of the eye using an ophthalmoscope. Examination of the interior of the eye using an ophthalmoscope.
The otoscope is positioned in the ear prior to examination of the auditory canal. The otoscope is positioned in the ear prior to examination of the auditory canal.
Breast self-examination. Breast self-examination.
Sites of referred pain Sites of referred pain
Video: Barriers - eye structures, digestive mucosa, respiratory mucosa & genitourinary mucosa

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