How walking in the searing 40C heat can be dangerous for even healthy hikers… as Dr Michael Mosley is found dead in Greece

Walking in high temperatures – the Greek isle of Symi has seen temperatures of between 35C and 40C in recent days – can be dangerous for even a healthy person. Walking in high temperatures – the Greek isle of Symi has seen temperatures of between 35C and 40C in recent days – can be dangerous for even a healthy person.