re: #61 A hollow voice says Vaccinate the world!

The air in a jet cabin is continually replenished from outside, plus it’s cycled through HEPA filters every few minutes. In other words, it’s safer than the air you breathe indoors on the ground.

I remember a very popular online “health and wellness coach” who was outraged to learn that the stuff they use to pressurize airplanes is not oxygen at all but mostly nitrogen. She had no clue that it came from outside and was the same as the air around us or, indeed, that air itself is mostly nitrogen. The uproar nearly closed her site down, but she re-tooled the scam slightly and recovered.