That product showed users AI summaries atop Google's traditional search results. Pichai hyped the product, calling it the biggest change to search in 25 years. Once again, users were quick to find problems.

When asked "How many rocks should I eat each day," the tool said, "According to UC Berkeley geologists, people should eat at least one small rock a day." AI Overview also listed the vitamins and digestive benefits of rocks.

Google responded by saying it would add more guardrails to AI Overview for health-related queries but said the mistakes weren't hallucinations, and were rather just rare edge cases. Search Vice President Liz Reid told employees at an all-hands meeting in June that AI Overview's launch shouldn't discourage them from taking risks.