Every year, as the leaves turn and a chill enters the air, a familiar debate lights up social media feeds. The question is simple yet divisive: when is the right time to put up the Christmas tree?

Physicists in Europe have quietly turned a classic holiday symbol into a cutting-edge experiment, 3D-printing a tiny Christmas tree out of ice instead of plastic or metal. The result is both a playful ...

Trees are known for capturing carbon dioxide as they grow. But they also soak up other gases implicated in climate change through microbes in their bark. The tree bark microbes feast on hydrogen, ...