Warning: In Bitter Cold, Beware The 'Umbles'

First we lose some fine motor skills, and we start to fumble. And tumble. And stumble.

Then our cognitive abilities are compromised. "We mumble and we grumble."

GO HERE:
http://www.npr.org/blogs/theprotojournalist/2014/01/26/265455459/warning-in-bitter-cold-beware-the-umbles