Just in case you missed it last night, Florida aerialist Nik Wallenda completed a tightrope walk that took him a quarter mile over the Little Colorado River Gorge in northeastern Arizona on Sunday. Wallenda performed the stunt on a 2-inch -thick steel cable, 1,500 feet above the river on the Navajo Nation near the Grand Canyon.  I don't know about you, but I was nervous enough for everyone there!