Meta Is Back on Trial in California

A.M. Edition for Aug. 18. Opening arguments are set to begin today in a hugely consequential trial accusing Meta of contributing to a crisis in youth mental health and which could cost the social media giant more than $1 trillion. WSJ reporters Meghan Bobrowsky and Erin Mulvaney preview what to expect as proceedings get underway. Plus, retail giant Costco prepares to enter the Medicare market .…