How Fluid Mechanics Helped Trippers for the Last 50 Years

The iconic hippy home accessory, the lava lamp turns 50 this week. It was the invention of Edward Craven-Walker. He took his inspiration from a liquid-filled egg timer he spotted in a pub. Anchor Marco Werman speaks with Cressida Granger, Managing Director of Mathmos, the lighting company behind that psychedelic lamp.