AI systems from Google, Microsoft, and Perplexity have been found to be citing questionable sources in their search results. The issue arose when users queried the "Sierra Leone IQ" or "Kenya's IQ," which led to responses referencing a database by Richard Lynn. Critics argue that Lynn's work is of poor quality and has been used to promote racist ideologies.

Source: https://www.wired.com/story/google-microsoft-perplexity-scientific-racism-search-results-ai/