The movement to reform public schools through competition and testing is a "hoax," according to a one-time promoter of the movement.
Urban leaders offer a model for tackling big global problems that nation-states are failing to address.
The founder of the Worldwatch Institute and the Earth Policy Institute pursues an unfinished agenda.
There's money to be made by selling "ruthlessly affordable" products to the world's 2.7 billion poorest people.
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