Kent Hovind is well known in evolution/creationism battles for (i) running a young earth creationism theme park in which dinosaurs and humans live together ('like the Flintstones?', as Tony Soprano asked) (ii) calling himself "Dr Dino" because he bought on a phony Ph.D. from a degree mill, and (iii) offering $250K to anyone who can prove (to his satisfaction) that evolution happened. Not surprisingly, the terms of his offer show such a basic misunderstanding of evolution that it's pointless.
If you are willing to risk wanting to tear your eyes out of their sockets, you can find a FAQ on him here.
Anyway, Hovind is going to need his money. He and his wife were just arrested on multiple federal charges, including tax evasion and making threats againt investigators. This is the latest, but perhaps most significant, chapter in a long running saga: Hovind has been battling the feds for almost two decades.