What's this tree crust?
![Popular Mechanics](https://cdn-fastly.hometalk.com/media/profile/2021/08/22/95323_1.jpg?size=91x91)
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Douglas Hunt on May 05, 2013
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Popular Mechanics on May 09, 2013
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Douglas Hunt on May 10, 2013
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Popular Mechanics on May 10, 2013
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