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The goal of the #MilkCrateChallenge is to make it from one side of the pyramid to the other, but it isn't so easy to pull off. Dr. Nehemiah Mabry explains why these milk crate structures are so unstable, and what can be done to fortify them: https://t.co/oHH8jXrWrw https://t.co/9pmnsHYW4K — PolitiTweet.org