Cutting Edge - Series 2 - Episode 5

5/6. Gilbert John and Wendy Sadler delve into the discoveries being made by scientists and researchers across Wales. The secrets of the amazing machine more valuable than the Mona Lisa, salvaged from a 2000-year-old Mediterranean shipwreck; the battle to beat one of the most common cancers in Wales; the fish oil that can boost brainpower; and why there's nothing new about 'global warming'.