The city of the future
• The smart city that will revolutionise urban life
• How the human race chose to live together
• Revealed – the 10 greatest cities of all time

Plus:
America’s Clash of Cultures
The US prepares itself for its most politically polarised presidential election in years
The British Empire
A century ago, Britain ruled a quarter of the planet. Experts examine the Empire’s impact
An Underground Revolution
Views are mixed about extracting shale gas. Energy saviour or environmental troublemaker?
Extreme Value Theory
From fierce weather to financial meltdown, life is full of uncertainties. Can they be predicted?