Bark is a compilation of dead cells that are gradually sloughed off as the trunk grows in diameter. It is formed by an amazing, thin layer of cells known as the vascular cambium. Outer bark — the part ...
The two years Princeton senior Joe Kawalec spent studying the natural camouflage of the ubiquitous downy woodpecker oddly enough began and ended the same way — tracing the outlines of birds. In ...
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