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Mike takes a trip to the La Brea Tar Pits in Los Angeles to find out about the important work being done in Pit 91. Then Mike travels north where he learns about rendering and discovers how much of a farm animal can be recycled.
Mike travels to Ohio to check on the Common Tern population and then he finds himself in Northern California plugging an abandoned mineshaft.
Mike Rowe works with a cave biologist and then braves the high seas in search of slime eels.