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And so we “know” this is probably already being done…. I wonder if it makes us more or less like our genetic cousins?

As for radiation, I measured it in the cabin on a recent European flight and it was around 3 microsieverts/h. Of course airline personnel are aware of this and have to sign a waiver that they accept these high-ish levels. But the companies certainly do not put this in their alluring adverts. And it’s one thing to go on a few 2-hour flights. What about those long intercontinental flights?