Producer Rachel and Simon discuss Elon Musk's Falcon Heavy launch, what it means for the future of space travel and whether putting a Tesla onboard was the greatest PR stunt of all time. In this episode we chat with David McKeown, a real rocket scientist. He explains how the two side booster rockets landed, and what the launch means for the Irish space programme. Our theme music was written and performed by Laurence Owen. Graphics by Theo Weedon, web design by Ian Bridgeman, support from the Wellcome Trust. The producer is Rachel Wheeley. More information about the series is at www.leveluphuman.com and you can support us at www.patreon.com/leveluphuman