Plot: Head Rush is a spin-off of the popular MythBusters show airing on Discovery's Science since it debuted in 2010. Described by Discovery as a "commercial free hour of MythBusters mashups, hosted by Kari Byron", the show features about ten minutes of new material - experiments and quizzes presented by Kari, as well as TV celebrity and scientist appearances, pitching the idea that "science is cool" - interwoven in fifty minutes of material from MythBusters episodes