Since the time of Isaac Newton, physicists have used mathematics to describe the behavior of matter of all sizes, from subatomic particles to galaxies. In the p

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In the spring of 2010, Harvard Business School’s graduating class asked HBS professor Clay Christensen to address them—but not on how to apply his principle

With the advent of digital devices and software, self-tracking practices have gained new adherents and have spread into a wide array of social domains. The Quan

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