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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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.
According to the FDA, adverse drug events harmed or killed approximately 1,200,000 people in the United States in the year 2015.
As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.
In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.