Scientist, best-selling author and entrepreneur, Gary Marcus talks to Tech Life about the forthcoming global summit looking at AI for good, and the need for regulation. We examine the Wagner Group's use of social media in Africa. How do you encourage teenage girls to take up tech and engineering jobs ? And prize-winning school pupils on making driving cars safer. (PHOTO CREDIT: BBC. Shiona McCallum meets Gary Marcus on the banks of the Thames, in London,)