Contributed by Stuart Corner Thursday, 26 July 2007. "They say airships are kept afloat by helium these days, but perhaps these use some hot air as well." <A HREF="http://www.itwire.com/index2.php?option=com_content&do_pdf=1&id=13711" target="_blank">http://www.itwire.com/index2.php?option=com_content&do_pdf=1&id=13711</A>