As new, highly transmissible variants of covid-19 spread across the U.S., health professionals have suggested that Americans wear two masks or upgrade to an N95.

At-home use of red light therapy masks requires a purposeful, consistent approach. These are the steps for the best results.

So, about masks -- they do next to nothing if you don't wear them properly. Yep, even the cloth coverings touted as the best thing since social distancing have instructions. We've laid them out below, ...