Robert Sapolsky has a fascinating article on this topic called "Bugs in the Brain." I couldn't remember the article title, but I just had to google for the term

Robert Sapolsky has a fascinating article on this topic called "Bugs in the Brain." I couldn't remember the article title, but I just had to google for the terms: sapolsky french kiss polar bear and that did it. Read the article and find out why. It's classic Sapolsky. http://www.sciam.com/article.cfm?id=bugs-in-the-brain http://www.sciam.com/article.cfm?id=bugs-in-the-brain