DULUTH — At first it looked as if the invasion had begun: the dreaded onslaught of forest tent caterpillars eating their way across Northland forests, a plague that hasn’t hit hard for 20 years. Up ...

Starting in 2020, a team of scientists from University of California, Berkeley went on a scavenger hunt that lasted for years. Their mission: Bring back live aspen roots from across the country. With ...