Notice how the American chestnut tree's bark is rough with deep furrows.
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As we trees age, we shed our protective outer bark. Since our bark is no longer alive, it cannot grow. Usually it peels or cracks; it then expands as we grow fatter.
TRIVIA: Suppose you carve your initials in the bark of a tree 4 feet above the ground. One or two decades later, you return to the same tree. How much higher up the tree will your initials be?
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