Welcome to the most epic war of a generation—the Noobs versus the Dummies. Who will prevail in a grandiose warfare of naive inexperience and sheer, unrelenting stupidity? It’s up to you to decide by ...

On shelves at a Humanetics facility in Huron, Ohio, skulls stare from their eyeless sockets, shiny and silver. Around a corner, a rack is filled with squishy, peach-toned arms, legs, torsos and butts.

A pulse oximeter measures blood oxygen levels at home and in healthcare settings. Abnormally low readings on a pulse oximeter might require medical care, especially if they are below 92%. Skin color ...