The age-old practice of turning tree leaves into mats has been revived ... painstakingly transforming leaves into art. Wisdom and memory were entwined. Another weaver, Sandra Essman, recalled ...

The math concept hidden in this tree art — geometric shapes known as fractals ... Like the branches, twigs and leaves of a tree, fractals repeat the same patterns across different scales.

One of the first major colonial protests—a demonstration against the Stamp Act of 1765—took place around the tree. Birch (Betula paprifera) leaves are doubly toothed around the margins and ...