What types of home-made masks are best? A video case study published in the journal Thorax, showed that two- and three-layered masks work best. Researchers used an LED lighting system and high-speed camera to film the dispersal of airborne droplets as participants spoke, coughed, and sneezed while wearing different masks. While single-layered cloth coverings reduced droplet spread from talking, double-layered masks better reduced droplet spread from coughing and sneezing.
That’s Gotta Hurt
The Injuries That Changed Sports Forever
Through the stories of a dozen athletes whose injuries and recovery advanced the field (including Joan Benoit, Michael Jordan, Brandi Chastain, and Tommy John), Dr. Geier explains how sports medicine makes sports safer for the pros, amateurs, student-athletes, and weekend warriors alike.Get the Book
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