There is another great post by Leighton Gage over at the Murder is Everywhere blog I enjoy so much. If you have not checked out the blog yet I highly recommend it. Six writers from around the world post random and well written items from their area of the globe.
This video of the falls gives you a feel for the sheer size of the place. It looks as though about two thirds of the video is taken from the Brazilian side and the final third from the Argentinean side.