"It is an interesting biological fact that all of us have in our veins the exact same percentage of salt in our blood that exists in the ocean, and therefore, we have salt in our blood, in our sweat, in our tears. We are tied to the ocean. And when we go back to the sea--whether it is to sail or to watch it--we are going back from whence we came."- John F. Kennedy Underwater cities, lost civilizations, crops, climate change, and dead zones.In...