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As a biostatistician working in bioinformatics, I'm well aware of both how powerful and how dangerous "big data" can be--powerful because it can tell you things you couldn't discover any other way, dangerous because it will tell you all kinds of things that aren't true unless you're very, very careful with your analysis. A lot of the people talking about "big data" and "data science" and all the rest of it are sound like teenagers who have just got their drivers' licenses.