Eton turns out prime ministers of various stripes and patches, but it also forges fine explorers. It seems to prepare its alumni perfectly for flying snakes, scorpions so large you can put leads on them and leeches in waving battalions; titanic drinking and dancing ceremonies (our explorer, Robin Hanbury-Tenison, suffers repeated blistering on the dance floor); the friendship of head-hunters; and for the exacting business of leading world-protecting, people-nurturing expeditions into the planet’s wild and vulnerable regions.