This Is Where I Leave You Tough-o-Meter

Tree Line (5)

Put away those oxygen tanks, Shmoopers: Tropper uses easy-to-understand language that's going to keep you safely under the shade at tree line. Plus, he writes about family relationships—and we're all experts at that, right? Still, about those relationships: there are plenty of characters and relationships to keep track of, so keep a pencil handy to trace the Foxman family tree.