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.

The Dollar Tree Chart: The gap down and subsequent plunge lower on Tuesday caused Dollar Tree to lose support at the 200-day simple moving average (SMA), throwing the stock into bear territory.

A first-ever study of its kind probing drought and tree rings in northern Utah has found evidence of even more severe droughts than modern history suggests. Researchers say the results show a ...

More About the Game of Trees Discover the Enormity of the Number TREE (3) In this game, different colored seeds are used to make a “forest” of trees, or branching graphs.

Thanks to a team of scientists, there's a new "tree of life" showing the ancestry of millions of different species dating back to the beginning of the planet. The team, led by Karen Cranston of ...