The Skeptics Guide #418 - Jul 20 2013

Live from TAM 2013; Guest Rogue: John Rennie; This Day in Skepticism: Viking 1; Special Report: Grand Canyon; News Items: The End of the World, Sailing Stones, Scrotal Evolution, Moons of Pluto; Interview with James Randi and Jamy Ian Swiss; Science or Fiction; Questions: Cynicism, Monsanto

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