Recently at our office we listened to a talk given by a really smart guy with a PhD in psychopharmacology.  He described a study he conducted on rats (think “Rats of NIMH”).  Rats were put into four groups for this experiment.  In group one, the rats were kept alone in their own cages with nothing.  In group two, rats were alone in cages with “enrichment toys”.  I’m not sure what enrichment toys look like for rats, but I imagine a running wheel, things to climb or chew on, and maybe a coffee table book, “Cheeses of the World”.   In
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