<A HREF="http://www.eurekalert.org/releases/upenn-pcn110600.html"> http://www.eurekalert.org/releases/upenn-pcn110600.html</A> <A HREF="http://news.bbc.co.uk/hi/english/sci/tech/newsid_1014000/1014080.stm"> http://news.bbc.co.uk/hi/english/sci/tech/newsid_1014000/1014080.stm</A>