Early in our marriage, my wife, Kristen, and I hiked a mountain trail. The day was full of color, with a hot, yellow sun overhead, lush evergreens on each side, and copper-colored soil beneath our feet. We came upon a tree on which numerous hikers had carved their initials. Filled with the joy of our new life together and the beauty of the natural world, we felt like leaving a memorial too. Using the teeth of my car key, I scratched “A + K” into the bark.