The Nepalese poet Santosh Kalwar once wrote that “all our wisdom is stored in the trees.” If it takes climbing to the top of a sequoia to be wise, many of us would swiftly accept a life of oblivion instead. Isn’t it peculiar how humans tend not to think of gravity until we’re farther off the ground than we feel we should be? It’s always there, anchoring us to the earth, but just as we breathe without a second thought until we’re forced to hold our breaths, our safety on the ground is forgotten until it is called into question. That is because gravity, while our strongest anchor, could also be our greatest downfall—pun intended?—when challenged. Some people choose to do exactly that, including professional tree climber Tim Kovar. Feet on the Ground, Head in the Sky Kovar spent his childhood in a state about as flat as it gets. …