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Penn & Teller expose the truth behind our supposedly toxic insides. We find out about "colonics" and those "cleansing" diets including today's diet darling, the "Neera Super Cleanse." An actual Parasitologist - a scientist who studies parasites - tel... (more)ls us the truth about the parasites among and within us. A visit to the world's largest inflatable walk-through colon rounds out the episode.