Material World - 28/01/2010

Fifty years on from the first steps in the search for extra-terrestrial intelligence, Quentin Cooper asks 'why the eerie silence?' Why have we detected no signal from ET? Does this mean we're alone in the universe? Meanwhile, down here on Earth, how universal are our non-verbal expressions of emotion? And how has cancer treatment changed from the days of 'one drug fits all'? How a new strategy of personalised medicine might save lives and at the same time save the NHS hundreds of millions of pounds. Plus, Do You Want To Be A Scientist? The latest from our talent search for amateur scientists.