http://www.newscientist.com/article.ns?id=dn2928

http://www.nature.com/news/2003/031229/full/031229-8.html;jsessionid=7BE6538978A77106C7C21A7037BCDAAD

http://www.bbc.co.uk/dna/h2g2/A769278

http://plus.maths.org/issue22/news/skimming/index.html

http://en.wikipedia.org/wiki/Stone_skipping

http://www.stoneskimming.com

http://news.bbc.co.uk/cbbcnews/hi/sci_tech/newsid_3359000/3359809.stm

Training video