“The US has been recording more than 1,000 covid-19 deaths and 45,000 confirmed cases a day. The flip side of the rapid spread, however, is there are progressively fewer vulnerable people to catch and spread the virus again. Researchers say they hope to determine how great a role the rise of this population immunity can play in managing the pandemic.” MIT Tech Review: Population immunity is slowing down the pandemic in parts of the US. (Keep your eye on viral spreads in prisons and other closed communities. At what point does the spreading stop? And once a certain amount of time passes, does it start again?)

+ “This is no longer a debate.”Florida sheriff bans deputies, visitors from wearing masks.