The hottest things are apparently also the coolest. While the iPhone was a comfortable winner in the British poll to find the '100 Coolest things on the planet', the other choices were not so obvious. From GHD hair straightners at No.14 to the Northern Lights phenomenon at No. 24, there were plenty of surprises in the study conducted by Costa Coffee to mark the launch of its new Iced Cold range of summer drinks. Here's a look at the Top 50 Coolest things in the World.