A simple trick can reveal whether your face mask offers sufficient protection: Try blowing out a candle while wearing it. A good mask should prevent you from extinguishing the flame. The rule isn't foolproof, but it should help weed out masks that aren't very protective. Ever since the Centres for Disease Control and Prevention (CDC) began recommending cloth masks for the general public in April, researchers have been evaluating the best materials for filtering the coronavirus. An ideal mask blocks both large respiratory droplets from coughs or sneezes - the primary method by which people pass the virus to others...
