Ultra-big TVs get cheaper every year. Many 75-inch and larger models now cost what 50-inch TVs did just a few years ago. Some of our picks for the best TVs are available in even bigger sizes. At the ...

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 ...