Thank you.
I can use that as a model for the "crowded room", or, think, airplane cabin with 8 APs and 300+ clients. Probably still not a lot in aggregate. BTW, given my overall weight and body fat percentage, that 80 kg was just about right for the water content of my body.
As for the radiation source (sometimes) in the sky, I know THAT one kills. When the doctors ask me what SPF sunblock I use, I ask them what is the SPF of the planet Earth. I try to keep it between me and the source whenever possible (harder in summer), and "hard" shade (concrete, steel, not leaves) when not.
Playing "Devil's advocate" may sound ridiculous, but it does, sometimes, elicit useful responses, like yours, rather than just hand-waving.