This new discovery at Stanford is one of the coolest things I've seen in a while (pun unintended). It's so simple, and yet so effective and brilliant. I never knew that we lost so much heat from our hands. I always figured it was mostly from the head. It's well worth the read, although the results are so outstanding that it almost feels faked:
http://news.stanford.edu/news/2012/august/cooling-glove-research-082912.html
http://news.stanford.edu/news/2012/august/cooling-glove-research-082912.html