The MBTA bus turned and wobbled and wheezed forward. Then it zoomed ahead and crossed onto a bridge. The driver had unwittingly gunned the accelerator, reaching 50 miles per hour. What seems like a T ...

AI chatbots can spit out convincing — if at times overconfident — natural language responses, but what if an AI could build custom virtual worlds based on a text description alone? Roblox is exploring ...