When I broke my neck, I heard it break. A crisp "pop!" from the base of my neck. I’m told my gymnastics teammates heard it, too, from across the gym. I’d broken some bones in my feet, the occasional finger, and sprained my ankles a zillion times, but never experienced such an audial reminder that we are, physically, not so different than our tree friends - made up of limbs that can be bent, snapped…