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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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.
After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.
Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.
More than 34,000 trademarked medication names and more than 10,000 generic medication names are in use in the United States.