Total SF welcomes co-host Kari Byron, the former "MythBusters" host who talks about San Francisco, her former job at The Chronicle, Muni, bike lanes and (most of all) her new project Crash Test World. Hosts Peter Hartlaub and Heather Knight are also joined by ProjectExplorer founder Jenny Buccos, who is teaming up with Byron on "Crash Test World," which will be on Discovery in September. (Episodes available at www.ProjectExplorer.org.)

Produced by Peter Hartlaub. Music is "The Tide Will Rise" by the Sunset Shipwrecks off their album "Community," and cable car bell ringing by 8-time champion Byron Cobb.

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