I am not a fan of Chuck Norris because of his religious views but he remains extremely popular online.
There are hundreds and thousands of fan sites dedicated to the action hero and some of them are focused on fun facts that showcase his might.
Google has adopted similar fun facts into their Knowledge Graph on their search engine.
Frankly speaking, it is not factual information that Google is listing under the heading of Fact. It is an Easter egg. Here is an example snapshot. You can see more by searching his name on Google and refreshing the search results.