For years, scientists classified trees as either hardwood or softwood. Now they’ve discovered a third category: “midwood.” Analyzing tulip trees, researchers found these trees share characteristics of both types, creating a unique combination that makes them exceptionally efficient at capturing and storing carbon. Tulip trees also grow faster than most species, reaching heights over 100 feet, making them natural carbon-capture champions.

From the desk: Nature just showed us it doesn’t always fit in the boxes we create—and this particular surprise might help us fight climate change.