Tesla's push into AI and robotics is proving costly

Tesla's massive investments in humanoid robots, self-driving cars and AI chips are hurting profits, but the company says it'll all pay off down the line. Why it matters: CEO Elon Musk indicated he's "never been more optimistic about the future," but acknowledged the investments could lead to uneven results. Zoom in: Tesla revenue jumped on record vehicle deliveries in the second quarter, but the company saw a significant dip in operating profit because of its heavy spending on R&D. Tesla…