Customers dine at Picos Restaurant, which received threats following their announcement of continuing to require masks, as the state of Texas prepares to lift its mask mandate and reopen businesses to full capacity during the coronavirus disease (COVID-19) pandemic in Houston, Texas, March 9, 2021.Callaghan O’Hare | ReutersThe risk of being exposed to Covid-19 indoors is as great at 60 feet as it is at 6 feet — even when wearing a mask, according to a new study by Massachusetts Institute of Technology researchers who challenge social distancing guidelines adopted across the world.MIT professors Martin Z. Bazant, who teaches chemical engineering and applied mathematics, …
