Days before Halloween, the price of cocoa, and therefore chocolate bars, is up. But Ebola isn't actually threatening the cocoa supply in West Africa, says commodities trader David Martin. Instead, the market is reacting to human fears, and for traders…

If taught young, self-control skills can have strong protective effects, even helping those whose vulnerabilities might make them more likely to fall behind economically. That's according to Walter Mischel, author of "The Marshmallow Test," in part four of his conversation…

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