Scientists have found that a single tree can be home to a trillion microbial cells — an invisible ecosystem that is only beginning to be understood. A black oak in the Yale-Myers Forest of northern ...

All species on Earth, both living and extinct, are related. We know this because of a biological tool called the tree of life. This "tree" takes the form of a diagram that maps the relationships ...

Bristlecone pines in the western U.S. have been alive for nearly 5,000 years, but an upstart Patagonian cypress challenges that record. This 1,400-year-old bristlecone pine on Mount Washington in ...

The Prometheus tree once stood in this grove on a mountain in Nevada. James R. Bouldin / Public domain via Wikimedia Commons In the summer of 1964, a graduate student named Donald Rusk Currey asked ...

Trees are tall. Humans, relatively speaking, are not. And we're not the most agile climbers in the animal kingdom, either. But we are crafty, and we can out-think even the most wizened redwood. But ...