It doesn't block it entirely of course - it just means that you get somewhat less of it. According to researchers, enough to mitigate the risk by a fair amount

It doesn't block it entirely of course - it just means that you get somewhat less of it. According to researchers, enough to mitigate the risk by a fair amount. Unfortunately we're going in circles here, and I'm going to have to bow out. You can believe whatever you want, about basic physics or anything else. It's a free planet, after all.