Sleeping teenagers and Catch 22

Minding teenage triplet grandchildren, who sleep all the time, I am filling my time with this.

In today's Times, we are told that the proposed one-way trip to Mars may damage astronauts' brains. This poses an interesting question: i.e.. to want to go on this trip in the first place, you'd have to be mad, but if you are chosen, presumably you have to be declared sane. Catch 22 all over again.

(I may have posted about this before, but as I said, I'm short of entertainment. The teenagers are now awake, fed,  and on their screens..)