Steve Caplin looks at the efficacy of Waitrose's coffee logs. There's also the problems Uber's self-driving cars have with jaywalkers, blood donors tracking their blood, Tim Berners-Lee's new browser, magnetising blood cells to cure disease, stretchable electronics, rhino horns made with horse hair to deter poachers, cream to help you learn languages or musical instruments and the world's brightest (multi-coloured) headlights.
