Five days after Elon Musk’s Grok 4 became one of the most powerful large language models in the world, Alexis Humphreys had her first severe asthma attack in 15 years. She laid down in her house in Boxtown, Memphis in the humid, sticky summer, struggling to breathe, inhaling a smell of gas that had started wafting into her neighborhood about a year before. “It felt like my chest was caving in,” Humphreys, 28, says on her front porch a couple of days later.  Advertisement Advertisement