WASHINGTON - When it comes to adolescents with math and science homework, more isn't necessarily better -- an hour a day is optimal -- but doing it alone and regularly produces the biggest knowledge ...

When it comes to adolescents with math and science homework, more isn't necessarily better—an hour a day is optimal—but doing it alone and regularly produces the biggest knowledge gain, according to ...

When it comes to adolescents with math and science homework, more isn't necessarily better -- an hour a day is optimal -- but doing it alone and regularly produces the biggest knowledge gain, ...

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