New and more contagious COVID variants are spreading across the U.S., prompting reminders about the importance of wearing face masks. Some health experts are even encouraging people to wear two masks instead of one. CBSN's Tanya Rivero spoke with Linsey Marr, a professor of civil and environmental engineering at Virginia Tech and an expert on airborne transmission of viruses, about why it could help.
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New and more contagious COVID variants are spreading across the U.S., prompting reminders about the importance of wearing face masks. Some health experts are even encouraging people to wear two masks instead of one. CBSN's Tanya Rivero spoke with Linsey Marr, a professor of civil and environmental engineering at Virginia Tech and an expert on airborne transmission of viruses, about why it could help. CBSN is CBS News 24/7 digital streaming news service featuring live, anchored coverage available for free across all platforms. Launched in November 2014, the service is a premier destination for breaking news and original storytelling from the deep bench of CBS News correspondents and reporters. CBSN features the top stories of the day as well as deep dives into key issues facing the nation and the world. CBSN has also expanded to launch local news streaming services in major markets across the country. CBSN is currently available on CBSNews.com and the CBS News app across more than 20 platforms, as well as the CBS All Access subscription service. Subscribe to the CBS News YouTube channel: http://youtube.com/cbsnews Watch CBSN live: http://cbsn.ws/1PlLpZ7c Download the CBS News app: http://cbsn.ws/1Xb1WC8 Follow CBS News on Instagram: https://www.instagram.com/cbsnews/ Like CBS News on Facebook: http://facebook.com/cbsnews Follow CBS News on Twitter: http://twitter.com/cbsnews Subscribe to our newsletters: http://cbsn.ws/1RqHw7T Get new episodes of shows you love across devices the next day, stream CBSN and local news live, and watch full seasons of CBS fan favorites like Star Trek Discovery anytime, anywhere with CBS All Access. Try it free: http://bit.ly/1OQA29B