Sam Altman takes the stand in trial against Elon Musk

OpenAI CEO Sam Altman is testifying against Elon Musk in a California federal courtroom, with Altman and OpenAI president Greg Brockman being primary defendants in the trial brought by Musk. The trial stems from a soured relationship between Musk and other OpenAI founders. Musk invested up to $38 million in OpenAI's early days.