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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
The horizontal fraction bar was introduced by the Arabs.
About 600,000 particles of skin are shed every hour by each human. If you live to age 70 years, you have shed 105 pounds of dead skin.
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 U.S. Preventive Services Task Force recommends that all women age 65 years of age or older should be screened with bone densitometry.