Splendido servizio con notevoli dati statistici sui 60 anni dalla conquista dell’Everest pubblicato su: http://www.guardian.co.uk/world/interactive/2013/may/28/everest-60-years-mountaineering-interactive?CMP=twt_gu e http://www.guardian.co.uk/travel/gallery/2013/may/23/mount-everest-first-successful-ascent-in-pictures?picture=409252599#/?picture=409252588&index=16