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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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.
Vaccines prevent between 2.5 and 4 million deaths every year.