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There are more nerve cells in one human brain than there are stars in the Milky Way.
Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.
Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
Bacteria have flourished on the earth for over three billion years. They were the first life forms on the planet.
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.