On this week's edition of Dr Chris Smith looks at Leprosy Day, which is intended to raise awareness of the 250,000 new cases of leprosy that are still occurring around the globe every year. Also Ben Valsler and Diana O'Carroll have been taking a look at some of this week's top science stories including some science that's straight from the horse's mouth or rather the cow's rumen - researchers have been reaching into a cow's stomach to discover the secret of making better biofuels!