Rory Stewart is a rare talent. Afghani Provincial Governor, British Cabinet Minister, widely acclaimed author, and now a hugely popular podcaster. All before the age of 50. Small wonder hundreds braved an icy November evening to pack the Main Hall of the RDS to hear him on Wednesday. And we weren’t disappointed. Standing and then walking alone across the stage, microphone in hand and not a note in sight, he carefully wove an intricate but global narrative. Skilfully mining the lessons of history to illuminate the challenges of today, he began by making the provocative comment that the victory of…