But in human's case, the lack of understanding of word Nixon is because they didn't know what that means in the first place and they don't have data to know or cross check what that word means. On the other hand, Google Search does have an access to the data (just strings in this case from an article) which it has to verify based on the user's query and then display it as the knowledge card and yet it couldn't because... (I don't know why exactly).