The number comes from a simple game of trees—meaning the charts used in graph theory. In this game, you make a forest of trees using seeds.

The Yule tree graph The Yule tree is a graph with one edge coming in and two edges coming out of each branch-point. The branches represent the time periods between the evolution of new species.

CHARLESTON, S.C. (WCSC) - Some trees and their branches in the downtown Charleston area are about to get a haircut. Dominion Energy held a public workshop Thursday afternoon at the Charleston Mariott ...

Developer Steve Melkerson of Caliber Homes said Tuesday he has made changes to his development plans to save the tree.