China's smoggiest city closes schools amid public anger

China's smoggiest city closed schools Wednesday as much of the country suffered its sixth day under an oppressive haze, sparking public anger about the slow response to the threat to children's health.

It's not the time spent in school, it's how it's used

In the past decade or more, the national debate about effective learning has centered on teacher quality. Now the discussion is turning to a second major resource in education: Time.

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