What Causes Pins and Needles?

Ever wondered what causes that strange tingling feeling? Well, settle in as Quick Questions explains how it works. Just be careful how you sit.
Hosted by: Hank Green
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Sources:
www.ninds.nih.g...
mentalfloss.com...
www.livescience...
www.ncbi.nlm.ni...
www.betterhealt...
www.nhs.uk/cond...