For more effective sun protection, select clothing with an ultraviolet protection factor (UPF) number on the label. Avoid tanning beds. Ultraviolet light from the sun and tanning beds can cause skin ...

Have you ever felt thunder shake the windows or watched lightning split the sky and wondered who—or what—might be behind such ...

Who were the Aztec, really? It’s complicated. Before their defeat by the Spanish in 1521, the triple alliance ruled Mesoamerica through complex trade networks—and warfare.