A unicorn Beanie Baby. A 15-pound green bowling ball. A pair of dentures. These are just some of the items left behind in robotaxis in the past year, according to Uber's annual Lost and Found Index. For the first time, the company is expanding its annual of accounting of things forgotten in Uber vehicles to include self-driving cars because, for the first time, Uber has enough self-driving cars on its platform to matter. Uber doesn't deploy its own robotaxis, but in the last few years it's bec