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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
There are more bacteria in your mouth than there are people in the world.
To maintain good kidney function, you should drink at least 3 quarts of water daily. Water dilutes urine and helps prevent concentrations of salts and minerals that can lead to kidney stone formation. Chronic dehydration is a major contributor to the development of kidney stones.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.