The funny thing is that 3000 years ago you wouldn’t get burned at the stake for thinking like that.

3.5 USD a month is a lot?

That’s easy to check. I’m currently insanely jet lagged and super tired, yawning every few minutes. My pulse oximeter is indicating 99% saturation, so that’s not it.

Edit: on the other hand, I’m a flight attendant, so my body is used to lower oxygen atmospheres, so I usually have >98% O2 levels.