Another theory I've heard is that Japanese people don't talk as loudly as Americans, so exhaled droplets don't travel as far. Honestly, though, it's probably t

Another theory I've heard is that Japanese people don't talk as loudly as Americans, so exhaled droplets don't travel as far. Honestly, though, it's probably the masks. Adherence isn't very good in the US. And maybe a third of the people I see with a mask are wearing them below their noses.