Concrete may be the world's most widely used building material, but it isn't widely considered a stimulating topic of conversation. John Wilson, filmmaker and creator of "How To with John Wilson", discusses his new documentary, "The History of Concrete," about the hidden side of a material that's more fallible than we might think and why we should care. 

Photo: A scene from THE HISTORY OF CONCRETE, a Magnolia Pictures release. (Courtesy of Magnolia Pictures)

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