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We've all seen the pretty pictures. Colored scans, produced by techniques that measure blood flow or the movement of a tracer chemical, reveal the activity of areas of the brain when we are thinking about something. The revolution in imaging in the past couple of decades has taught us a lot about what the brain is doing while we cogitate. One thing we've learned is that those more active areas aren't always the same from brain to brain when considering a certain problem. Not all brains are the same size or shape, as you might expect, but they also think differently. 
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