OK, this is a bit of a tease. But for something a little different from the usual Popper and Speranza: http://www.nature.com/srep/2011/110926/srep00100/full/srep00100.html?WT.ec_id=SREP-631-20111003 John Sent from my iPad------------------------------------------------------------------ To change your Lit-Ideas settings (subscribe/unsub, vacation on/off, digest on/off), visit www.andreas.com/faq-lit-ideas.html