Papers about effectiveness of basic masks at https://docs.google.com/document/d/1HLrm0pqBN_5bdyysOeoOBX4p...

The Czech Republic story at https://docs.google.com/document/d/1EWpWmyjzM4sNBF-7jp_1Y9a-...

And a more in depth video from Jeremy Howard (fast.ai guy) at https://www.youtube.com/watch?v=BoDwXwZXsDI

A brilliant man: "Every tragedy has its victims, its heroes, and its charlatans. Victims suffer. Heroes do all they can to help. Charlatans deceive others for personal gain. Be the hero. Beware of the charlatans."