Posted: Apr 25, 2012 6:57 pm
I found a couple of interesting articles from Science Daily. They are a few years old, but here you go:
http://www.sciencedaily.com/releases/20 ... 153037.htm
http://www.sciencedaily.com/releases/20 ... 112658.htm
http://www.sciencedaily.com/releases/20 ... 153037.htm
http://www.sciencedaily.com/releases/20 ... 112658.htm