Solar power could be 'king'

The International Energy Agency says solar power could become a leading power source. Tim Gould co-wrote the IEA's World Energy Outlook and tells us the transition could take some years, but solar power is cheaper than new coal or gas-fired power stations in most countries. Also in the programme, the BBC's Tamasin Ford meets several female African entrepreneurs to find out about their experience of sexism in the male dominated finance and startup scene on the continent. Plus, as Apple launches its latest batch of smartphones, we find out from Andrei Frumusanu of hardware magazine Anandtech, about the "five nanometre process" technology underpinning the company's new microchips in the devices, which enables 171 million transistors to be laid out in just one square millimetre.