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On this chart of a 'normal' distribution, showing the classic 'bell curve' shape, the mean (or average) is the vertical line at the center, and the vertical lines to either side represent intervals of one, two and three sigma. The percentage of data points that would lie within each segment of that distribution are shown.

Explained: Sigma

How do you know when a new finding is significant? The sigma value can tell you — but watch out for dead fish.

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3 questions: P vs. NP

After glancing over a 100-page proof that claimed to solve the biggest problem in computer science, Scott Aaronson bet his house that it was wrong. Why?

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