This is very helpful. Easy to understand too.
Allllll my windows are open!
english.elpais.com/society/2020-10-28/a-room-a-bar-and-a-class-how-the-coronavirus-is-spread-through-the-air.html?ssm=TW_CC&fbclid=IwAR2Zt-BC7sDCw__rP1jocpqbMQXAwdviBqVeytvbTXeuyfjVOEukB69jKAo
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