Guardian: <figure> <figcaption>A Pakistani boy cools off in a park in Multan, as temperatures reached record highs in a continuing heatwave. Photograph: MK Chaudhry/EPA</figcaption> </figure> Mohenjo-daro, a ruined city in what is now Pakistan that contains the last traces of a 4,000-year-old civilisation that flourished on the banks of the river Indus, today entered the modern history books after government meteorologists recorded a temperature of 53.7C (129F). Only Al ‘Aziziyah, in Libya …