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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
The calories found in one piece of cherry cheesecake could light a 60-watt light bulb for 1.5 hours.
HIV testing reach is still limited. An estimated 40% of people with HIV (more than 14 million) remain undiagnosed and do not know their infection status.
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.
The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.