Working will become optional in just 20 years thanks to advances in artificial intelligence and robotics, Elon Musk has claimed. The world’s richest man said the decision to work will become like a hobby such as sport or growing your own vegetables. And, somewhat curiously for a man worth $360billion, he insisted that money will also become irrelevant in the future. Mr Musk told the US-Saudi Investment Forum in Washington: ‘In ten to 20 years my prediction is that work will be optional. It’ll be like playing sports or a video game or something like that. ‘If you want to...