'Nearly 80 times cheaper than lithium': China is working on ultra affordable iron battery that can run 16 years without degrading — using one of the most abundant elements on Earth to store power and a water-based electrolyte system that cannot explode

'It ultimately made people realize that music was worth paying for': Spotify's Sten Garmark on how the streaming giant created an entirely new business model, and its mission to convince users that 'there was something better than free'