What is Fun For The Feebleminded?
1.
Any diversionary activity that requires a fair amount of effort and absolutely no brain power; generally makes the person doing it look slightly stupid.
Building a house of index cards? That's fun for the feebleminded if I ever saw it.
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One of NATO's military firearm calibers. The 5.56x45mm NATO catridge is used pretty much only for allied (America, UK, France, Ger..