Once again, the Citadel Outlets in Commerce is laying claim to hosting the tallest fresh-cut Christmas tree in the world. It’s a record the shopping center tries to match, or even top, year after year ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

a Spatial pattern of tree numbers within a 0.01° grid. b Latitudinal distribution of tree density and total tree numbers, with shaded areas indicating the standard deviation of the estimated tree ...

Trees are the “lungs” of the Earth — leafy organisms that produce the oxygen we breathe in every day and cycle the carbon dioxide we breathe out. But despite trees’ vital importance to human survival, ...

A 1% improvement in Louisville’s tree canopy over the course of a seven-year period may not seem like much. But from TreesLouisville executive director Cindi Sullivan’s perspective, the numbers ...