What's Your Funny Bone?

Sometimes, when you bump your elbow really hard, your arm can get all weird and tingly, all the way down to your fingers! Some people call that "hitting your funny bone," but what you're hitting isn't a bone at all!
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SOURCES:
mentalfloss.com...
www.bbc.com/fut...
www.britannica...
www.childrensm...
io9.gizmodo.co...
www.livescienc...
www.livescienc...
www.ncbi.nlm.n...
www.webmd.com/...