Tim NoakesUniversity of Cape Town emeritus professor Tim Noakes loves challenging convention and being challenged.  ‘It’s when I learn,’ he says. Noakes has challenged conventional ‘wisdom’ seven times in his distinguished career. He has been proved right six times. He expects the same to happen when he goes back on trial in October 2016 in his latest challenge: to conventional ‘wisdom’ on diet. In the second of a 2-part series,  he reveals what really drives him. – Marika Sboros