Most people are familiar with the notion that "tree rings" — the concentric bands visible on a cross-section of a tree's trunk — serve as an indicator of a tree's age. Researchers at the University of ...

A tree with a spiral trunk is growing in a city. - Wulingyun/Getty Images While it is one thing to see a bonsai or other trained tree growing in a spiral, it is far more surprising when you find a ...