"Don't go chasing waterfalls". Words of advice from TLC, the greatest American girl group of the 1990s. No doubt it's a catchy refrain, but what a terrible message! Why should three women who achieved their own dreams dissuade their fans from "chasing waterfalls"? To stick to the rivers that they're used to? I suspect T-Boz and co. were trying to nip future competition in the bud. And it's not just bad advice on a metaphorical level. As we've discovered in Iceland, waterfall-chasing can be very rewarding indeed.