a =ope or protective equipment of any kind, shuffles across narrow sills of s=one such as the "Thank God" ledge high atop the sheer granite face of Half Dome in Yosemite National Park. When J.B. MacKi=non, a Canadian freelance writer, approached Honnold about having scientis=s look at what goes on in his

a rope or protective equipment of any kind, shuffles across narrow sills of stone such as the "Thank God" ledge high atop the sheer granite face of Half Dome in Yosemite National Park. When J.B. MacKinnon, a Canadian freelance writer, approached Honnold about having scientists look at what goes on in his