Interesting article. http://www.nytimes.com/2005/06/14/science/14cycl.html?ei=5090&en=391826c48a3a1a17&ex=1276401600&adxnnl=1&partner=rssuserland&emc=rss&adxnnlx=1119280555-9Dd5JiIYfN+PcI5+7ApEXA