This trick only works for bosons
*Edit: I think.
At any rate, these depths of physics are quite complex and not very intuitive, and this kind of discovery shows it is very easy to overlook things. A giant discovery could be looming in the horizon...
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In the lab. The paper contemplates the possibilities for nucleons too - it's just harder for spin particles: http://www.uibk.ac.at/exphys/ultracold/projects/levt/efimov/...
Sort of. There are some tricks you can play with fermions (eg. align all of their spins) to get very analogous effects.