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Some structures are instantly recognizable. You can see a massive cooling tower from miles away. Wide at the bottom. Narrow through the middle. Then wider again near the top. It looks a little like an enormous concrete hourglass. And if you've ever driven past a power plant and seen one releasing a giant white cloud into the sky, you may have wondered two things: Why is it shaped like that? And what exactly is coming out of it? The answers are connected. That strange shape isn't just architectur …