Who knew, apparently masks work in real life:
https://www.poverty-action.org/sites...ity_083121.pdf
Here is RCT pre-registration:
https://clinicaltrials.gov/ct2/show/NCT04630054
Here is WP summary:
https://www.washingtonpost.com/world...id-bangladesh/
Also just an impressive piece of work by a set of talented economists. This is not peer-reviewed yet but knowing the authors I doubt they screwed up. I hope Science will publish it.