Read other letters about this article
http://www.sciencemag.org/cgi/content/abstract/1152538
That's a scientific abstract. To read the real article, you need to pay, or visit the library. You also may need to bone up on some probability and statistics.
Here's the Times UK article about the paper:
http://www.timesonline.co.uk/tol/news/world/article516033.ece
I assume that SailFree has already read this paper, and can offer some keen insights into why all the math is wrong.