A famous feature near the summit of Mount Everest, known as the Hillary Step, has collapsed, potentially making the world's highest peak even more dangerous for climbers. Last year, pictures appeared to show a change in shape to the 12-metre rocky outcrop, named after Sir Edmund Hillary, the first person to scale the mountain. It is thought to have been destroyed in Nepal's 2015 earthquake, but snow coverage made the news hard to confirm. British mountaineer Tim Mosedale confirmed the collapse after he reached the summit this week. "It's official — The Hillary Step is no more," he said in...