VideoWhat is dark energy, and could it destroy the universe? If dark energy has its way, the universe may rip itself apart. Astrophysicist Kathy Romer gives the low-down on this enigmatic stuff. Video
TechnologyCan we quit cobalt batteries fast enough to make electric cars viable? Electric cars depend on cobalt as a key ingredient in their batteries, but a new analysis reveals we may run out by 2030, while car firm Tesla is moving to other types of battery in China Analysis