The CDC recently (I read about it, not read the report itself) claimed masks work and cited 15 studies. Not one was a proper control group study! Zero!
Real studies, from Europe, say masks may barely work, but cause more harm than good with other medical issues being higher in the mask-using group.

Masks for children under 10? VERY BAD says the studies on those. Kids aren't big enough to breath with those things on, period. It's a sick world where people are told to put masks on their 5 year old...