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![John Locke](//upload.wikimedia.org/wikipedia/commons/thumb/b/b8/John_Locke.jpg/45px-John_Locke.jpg) | This user is an empiricist, and believes that knowledge is subject to continued revision and falsification. |
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![](//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Coffee_cup_icon.jpg/42px-Coffee_cup_icon.jpg) | This user likes the taste of coffee, not cream / sugar / hazelnut / what have you. |
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This user understands the summation convention.
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![](//upload.wikimedia.org/wikipedia/commons/thumb/7/73/Nicolas_P._Rougier%27s_rendering_of_the_human_brain.png/60px-Nicolas_P._Rougier%27s_rendering_of_the_human_brain.png) | This user knows too much. |
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