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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
Never take aspirin without food because it is likely to irritate your stomach. Never give aspirin to children under age 12. Overdoses of aspirin have the potential to cause deafness.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.