It’s 8.15am in a bright German secondary school classroom and Jack Teahan from St Brendan’s College in Killarney is trying to explain Puck Fair, the ancient August festival in nearby Killorglin. “A goat goes up on a scaffolding and he’s king for three days,” Jack begins, not noticing the German teenagers’ jaws drop. Jack – and eight other Killarney transition- and fifth-year students – are midway through their weeklong visit to Roth, a pretty town in the Frankonia region of Bavaria in southern Germany. The steep gabled houses and cobbled streets are a long way from Killarney – almost 2,000km...