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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
Before a vaccine is licensed in the USA, the Food and Drug Administration (FDA) reviews it for safety and effectiveness. The CDC then reviews all studies again, as well as the American Academy of Pediatrics and the American Academy of Family Physicians. Every lot of vaccine is tested before administration to the public, and the FDA regularly inspects vaccine manufacturers' facilities.
Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
Green tea is able to stop the scent of garlic or onion from causing bad breath.
Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.