This week, Chris explores some of the cutting edge research taking place in Aberdeen. We meet a scientist making new cannabis-like chemicals that lack the side effects of the real thing, talk to a man exploring the deepest part of the Pacific - 7 miles down - to find out what's living there. Plus, thalidomide - 50 years on. Scientists now know why it had the damaging effects it did on unborn babies, but can they make a safe form of the agent so it can be used to treat cancers, leprosy and HIV?