Whenever there are lists for who's the smartest human characters in DC Rip always seems to be forgotten or brought up only to be forgotten. I don't agree with some of the usual choices. When you're talking about intelligence immortals like Vandal Savage get listed just for experiencing things more? If Mr. Terrific is the undisputed number #3 then shouldn't the others have similar skill sets in science and experts of whatever field(s) they study? I know Bruce Wayne is smart but I don't rank that in the same terms, if I did Max Lord would rival him.
I could understand the normal DCU not knowing where to place an unknown like Rip but he's listed as the guy who invented time travel! Something very few people in DCU even understand or control. He's an inventor, knows countless customs/history, master chess player and was regularly invited into the lab of Brainy 5. A family friend that very likely acted as his teacher. That should at the VERY LEAST rank the top 5.