Share Radio's technology editor, Steve Caplin, talks to Simon Rose about Amazon's new e-cargo bikes and a new more efficient biofuel. Renewable energy storage takes a leap forward with sand batteries, while pyramids could be the way forward for solar cells. AR glasses may not be needed; there could be AR contact lenses instead while NASA want to send mini swimming robots to moons of Jupiter and Saturn. Steve admires a coal-powered motorbike and discusses the latest development in 3D printed wood.
