If hand sanitizer doesn’t have this important ingredient, it’s can’t kill germs — what to know

Hand sanitizers made with at least 60% alcohol help kill gems, according to the CDC. These are the top options from Purell, ...

Especially for kids who don’t wonder: Explaining things we barely notice

“I’ve been with you since you were born,” Air says. The text discusses wind, airborne particles, weather — and the fact that ...