If you enjoyed this article, I’d like to ask for your support. Scientific American has served as an advocate for science and industry for 180 years, and right now may be the most critical moment in ...

Arteries carry oxygenated blood away from your heart. They have thick walls and a muscular layer that keeps your blood moving. Arteries can be as wide as a nickel (about two centimeters). They are the ...

Social Security provides lifetime income to retirees, disabled workers, and families meeting specific criteria. Earning 40 credits, typically from work, qualifies U.S. workers for Social Security ...