Our neurotoxic world (part one): Chemotherapy and the brain

Your brain is a resilient organ, but vulnerable to nasty environmental insults too. This week, in the first of two shows navigating our neurotoxic world: it's been dubbed 'Chemofog' and 'Chemobrain' by cancer survivors: short-term memory loss, foggy thoughts, fatigue - lingering sometimes years after chemotherapy. Could chemo be doing more than killing off cancer cells? New research suggests it may be more toxic to your nerve cells than cancer itself. Natasha Mitchell investigates.