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Klineberg said that as a city at the forefront of the country's demographic revolution, Houston offers a glimpse into America's future, and the survey's assessment of the city may offer important lessons for strengthening the rest of the country: create policies that moderate the inequalities, nurture a far more educated workforce, develop cities into environmentally and aesthetically appealing destinations, and empower all members of a multiethnic society.

John Hunter puts all the problems of the world on a 4′x5′ plywood board - and lets his 4th-graders solve them. At TED2011, he explains how his World Peace Game engages schoolkids, and why the complex lessons it teaches - spontaneous, and always surprising - go further than classroom lectures can.

The world on Tuesday marks a quarter century since the world's worst nuclear disaster at Chernobyl in Ukraine, haunted by fears over the safety of atomic energy after the Japan earthquake