A mysterious letter delayed the Uber-Waymo trial

Uber's headquarters in San Francisco. Eric Risberg / AP

A San Francisco judge (again) delayed Waymo's upcoming trial against Uber after a mysterious letter from a former employee of the ride-hailing company surfaced. The judge granted Waymo's request for more time to prepare for the trial, since the letter had been withheld by Uber.

Why it matters: The letter was uncovered last week, when the Department of Justice contacted the presiding judge about its existence. Though the letter's contents aren't publicly available, and even Waymo's lawyers have only seen a redacted version of it, it appears to contain important information about Uber's acquisition of Otto Trucking. It also appears to explain why the thousands of proprietary files Waymo says its former employee took with him never seemed to have made it onto Uber's computers.