Speaking of 1 variable at a time: I've noticed that numerous studies that "show" masks have a high efficacy against the spread of covid involved test cases that not only introduced masks but also introduced sunlight, additional distancing, therapeutics, and even used particles larger than covid.
It explained why it was my deep blue city had a big report on "25+ studies that show masks are effective" yet I was able to quickly DDG a collection of at least as many studies that show they are not.
Speaking of 1 variable at a time: I've noticed that numerous studies that "show" masks have a high efficacy against the spread of covid involved test cases that not only introduced masks but also introduced sunlight, additional distancing, therapeutics, and even used particles larger than covid.
It explained why it was my deep blue city had a big report on "25+ studies that show masks are effective" yet I was able to quickly DDG a collection of at least as many studies that show they are not.