Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. Trees depicted in ...

What makes a tree a tree? Or rather, why can we recognize trees in even quite abstract depictions when they are so varied in nature? Researchers have found a clue in the branches, and used math to ...

You may have heard that pruning spruce trees in the landscape is an important way of maintaining their health, size, shape, and vigor. But this is more applicable to deciduous trees than evergreens.

It’s that time of year again—are you going to head down to the Christmas tree farm to pick out your annual spruce tree or go out on a limb and finally invest in an artificial tree that’ll stick around ...