It's the day of the first manned mission to Mars.

As Commander Carl Ehrlich's twin brother Kevin awaits the final countdown in a local bar it seems the mission just might offer him the perfect means of gaining some long-awaited one-upmanship on his internationally-renowned, hugely successful, ever-so-slightly older brother!

Taking inspiration from Einstein's General Theory of Relativity, Ian Sansom discovers it's all relative in his story of sibling rivalry and space travel.

Read by Trevor White

Writer ..... Ian Sansom

Producer: Heather Larmour

First broadcast on BBC Radio 4 in November 2015. Show less