The following article is a response to an article on Yahoo Finance by Michael Breen.
This article was originally published in the September/October, 2016 issue of National Geographic.
The article is reproduced here with permission.
Michael Boudreau, M.D., is a medical doctor and author of The Power of Your Brain: How to Break the Cycle of Stagnation and Change Your Life.
Michael has published over 40 articles for Yahoo Finance, including several of his own.
For more information about Michael, please visit his website.
©2016 Yahoo Finance