Any truths to the baking soda gender prediction tests?!

Heather
Particularly wondering if anyone has tried the baking soda test? We tried this the other day just for fun (obviously not going out shopping for clothes). We were wondering if anyone has tried it and had the correct results? They say if you add pee to a few tablespoons of baking soda and it fizzes, it's a boy. If it does nothing, it's a girl.  Curious if this has been tried by others :)