Heroism, sacrifice, defeat? The enduring mystery of George Mallory’s final Everest attempt

It’s almost a century since the 1924 expedition ended in tragedy, yet the question of whether the climbers conquered the summit remains unansweredOn the morning of 6 June, 1924, George Mallory – one of the world’s greatest mountaineers – set off with his companion, Sandy Irvine, from a camp on the slope...