New York — Elon Musk's startup xAI apologized Saturday for offensive posts published by its artificial intelligence assistant Grok this week, blaming them on a software update meant to make it function more like a human. After the Tuesday upgrade, Grok praised Nazi leader Adolf Hitler in the posts on social media platform X, and suggested that people with Jewish surnames were more likely to spread online hate. X deleted some of those posts several hours later, amid growing outrage. "We deeply apologize for the horrific behavior that many experienced," the company posted on X Saturday, adding that it had...