Arden Hayes, 6, went on Jimmy Kimmel and floored both the host and his audience with his knowledge.
In the video, Jimmy tested him on the periodic table of elements. But Arden is no stranger to the show, previously impressing audiences with his knowledge of presidents and geography.
"Six-year-old genius Arden Hayes returned last night to make us all feel dumb...," said Kimmel in a post on YouTube.
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