Who is the man wearing a bike helmet around COP27?
Ivorian activist Andy Costa has become one of the most photographed participants at the UN climate summit, always donning his neon green headgear
Peter Diamandis: ‘I hope to see flying cars available by the end of this decade’
The US engineer talks to EL PAÍS about the next technological breakthrough, the limits of human longevity and his friendship with Elon Musk