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Eduardo Paes: The 4 commandments of cities. Jennifer Pahlka: Coding a better government. Nancy Duarte: The secret structure of great talks. Hewlett Packard's Corporate Global Vision. Imagine a company catalyzing a new approach to student learning and achievement in science, technology, engineering, and math (STEM).

Hewlett Packard's Corporate Global Vision

And what if the company’s purpose were to prepare students around the world, from all corners and walks of life, to collaborate in solving social and environmental problems, beginning right now? Imagine the power of the relationships these children will have when they are in their 20s and 30s as they continue to work with each other. Twitter Can Predict the Stock Market. The emotional roller coaster captured on Twitter can predict the ups and downs of the stock market, a new study finds.

Twitter Can Predict the Stock Market

Measuring how calm the Twitterverse is on a given day can foretell the direction of changes to the Dow Jones Industrial Average three days later with an accuracy of 86.7 percent. “We were pretty astonished that this actually worked,” said computational social scientist Johan Bollen of Indiana University-Bloomington. The new results appear in a paper on the preprint server. Bollen and grad student Huina Mao stumbled on this computational crystal ball almost by accident. Earlier studies had found that blogs can be used to gauge public mood, and that tweets about movies can predict box office sales. Dan Ariely asks, Are we in control of our own decisions? Shawn Achor: The happy secret to better work.