Boom—MASKS WORK & COST EFFECTIVE—Just 20 days after mandatory face mask rules, new #COVID19 infections lowered by ~45% in German study.

Put that in your pipe and smoke it.
https://www.pnas.org/content/early/2020/12/02/2015954117 https://twitter.com/alinouriphd/status/1335296310203871232

p.s. actually, don’t ever smoke. Epidemiologist not endorsed.

3) Be cool, listen to Bill Nye on masks! https://twitter.com/drericding/status/1335018202124972033

4) Look at masks in action under laser light. Masks and aerosols:

5) Mask and airborne science compilation video

6) Both ventilation and masks needed to reduce risk indoors. But most buildings not ventilated well enough.

7) we know public health measures like mask mandates work to prevent infections and hospitalizations. But so many leaders ignored the science. That is the greatest tragedy of #COVID19 pandemic.