How to make complicated molecules using a simple process - essentially tying knots in a string-like compound! Rob Stockman's team's latest paper could contain important clues to the making of cheaper medicines. The paper is at http://pubs.rsc.org/en/Content/ArticleLanding/2011/SC/C1SC00371B (we think it is free but you'll have to log in, but you may need to open a free RSC account at http://pubs.rsc.org/en/account/register) More chemistry at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos