A popular YouTuber has created the first functioning lightsaber, using propane gas burning at around 4,000°C to create a retractable plasma beam. Canadian James Hobson, known as 'the Hacksmith', has a following of ten million subscribers and works on turning popular science fiction items into reality. Inspired by a love of Star Wars, he has previously made various lightsabers, but wanted to produce 'the world's first, retractable, plasma-based' version. For ...