Lots of trees shed their leaves to prepare for chilly winter temperatures – but not all of them. Evergreen trees, like pines and spruces, keep their needles throughout the winter. So how do they do it? We asked science communicator and plant expert Brandi Cannon-Force to help us find the answer.Have a question that’s really needling you? Send it to us at BrainsOn.org/contact, and we’ll help find a tree-mendous answer!