Bill Gates calls AI the most dangerous weapon of all time. He warns of 20 years of tumultuous disruption. He says society may split between those embracing AI and those rejecting it. He sees near-term risks from models without safeguards. He states AI surpasses nuclear weapons in danger. He argues current policy responses are inadequate. He notes AI can write code, find cyber flaws, reason in biology and disrupt jobs. He says industry warnings about AI risks are sincere.