Jim al-Khalili talks to botanist Geoff Palmer, the UK's only professor of brewing and distilling, about revolutionising the malting industry and his unusual scientific career after arriving from Jamaica in 1955 as a 14 year old boy. When he went for an interview for an MSc in 1964 the representative from the Ministry of Agriculture suggested he go back home and grow bananas. Why? Because he didn't know the difference between wheat and barley. Undeterred he went on to become a world authority on barley, brewing and distilling and Scotland's first black professor. His research on how malt could be made more quickly saved the brewing industry millions. But he says, it's only through good luck and with the help of good Samaritans that his career took the course it did, helping him get to university and even to finish school. Now at the age of 75, he's still fighting to make education and a scientific career available to everyone, regardless of their background.