Suppose an intelligent water breathing species had developed on Earth. It's intelligence is comparable to humans, and it has manipulators on par with human hands in facility (although they probably aren't hands. Mouths? Tenacles?) Now, how is world history different with these intelligent sea creatures, capable of bulding things and inventing things, floating around in our oceans? Feel free to propose what species these sea creatures would have evolved from, what their societies would be like, and how they'd relate to man, the air-breather.