QotW - What makes your blood run cold?

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QotW - What makes your blood run cold?
« on: 06/12/2011 19:30:04 »
I was just wondering what the sensation was when your blood runs cold say, from fingernails scraping down a school blackboard?

The sensation seems to start in the skull and travel down the back and into your spine.  So obviously, something to do with nerves but what is happening?  

Thanks for a great show!
Asked by Paul from Woldingham

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« Last Edit: 06/12/2011 19:30:04 by _system »