From the BBC World Service: One of the world’s leading technology bosses has warned there could be “carnage" if a bubble in AI share prices bursts. The chief executive of Cisco, Chuck Robbins, has told the BBC that while some companies won’t survive, artificial intelligence will be “bigger than the internet.” Plus, we take you to Saudi Arabia, where the construction of a huge skyscraper — 20 times the size of the Empire State Building — has been suspended.