Chain dragging is good for finding voids in the concrete deck. I don't how effective it would be for checking the structural integrity.

I learned my "texting" type habits from playing multiplayer PC FPS games. A medium where both brevity and quickness are desired since each second you are typing could 1 sec away from having to re-spawn. Being a Luddite when it comes to phones I still only have a "dumb phone" and texting is extremely painful with a…

She always reminded me of the Dark Crystal movie.

The Vortices are called von Karman vortex streets http://en.wikipedia.org/wiki/K%C3%A1rm%C3%A1n_vortex_street