It fascinates me that a leaf knows when its time has come to fall. Perhaps some combination of day length and temperature gives the signal. But maybe it’s just the good taste to abort, an inner sensitivity to the needs of the whole that gives its parent tree a chance to hibernate with its blood gone underground for the winter, safe from freezing. Whatever the signal for the moment of leaf launch, I’m glad they don’t all get the same idea on the same …

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