Apparently there is a crack in the falls, and just in another 40,000 years it will move back and create another gorge.
Wow man, and you're going to Dubai next??? Holy crap, they have a humongous indoor SKI RESORT there. Saw it on the Discovery Channel this morning. Not to mention the awesome cars roaming the streets there. I'm jealous, sounds like you had (and are going to have) a lot of fun.