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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. Sound ridiculous to you? Do you wonder: How is this possible, given that one billion children live in poverty, many in remote rural villages, others in densely populated urban slums? When so many children in developed countries aren’t even getting decent educations, much less children in the developing world? What if I told you that middle school and high school students from some of the world's most deprived communities are already working together on solutions for sustainable energy sources and to purify water?

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. But Bollen wanted to build a more nuanced emotional barometer. Bollen and colleagues checked a huge Google database to see what other words are commonly used in conjunction with the original 72 adjectives, and added those words to their lexicon.

“I sank into my chair. Dan Ariely asks, Are we in control of our own decisions? Shawn Achor: The happy secret to better work.