h a l f b a k e r y
Not so much a thought experiment as a single neuron misfire.
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There are "swim in place" pools that feature fast flowing
water that create what is essentially an aquatic treadmill.
This takes that concept and flips it around.
The pool is suitably stretched out into an oval course like a
race track and rather than swimming against the flow and
in one place, you swim with the flow and go very
If you've ever swam downstream in a fast flowing river
you'll know that it's pretty exhilarating.
||Trapped against the intake side of the pump, the doctor designs a slightly less exhilarating pool.
||( Amazing what you can design these days with underwater paper and waterproof inks. )
||I've done that at the top of one of those waterfalls in Yosemite that has signs saying "If you go over the falls you will die". You're right, it's pretty exhilarating.
||Instead of having one big intake and one big output for the
water stream you could have hundreds of smaller ones all
along the path. This would minimize any unwanted grinding
up of the swimmers.