Sir Ranulph Fiennes has had an extraordinary life.The 78-year-old, who prefers to go by Ran, was the first to circumnavigate the globe on its polar axis, has discovered a lost city, completed unsupported polar expeditions, run seven marathons in seven days on seven continents, climbed the Eiger by its precipitous North Face, reached the summit of Mount Everest at the age of 65, and more – remaining hungry for adventure well into his seventies.He has undoubtedly earned the moniker “the world’s greatest living explorer”, having traversed remote parts of the globe where no-one had set foot before.