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  1. Earth

    Pole flips tied to plate tectonics

    A lopsided arrangement of continents could lead to reversals in Earth's magnetic field.

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  2. Ancient Rome forbade downtown traffic in day

    Roman road congestion is as enduring as the Eternal City.

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  3. Letters

    Lowdown on Earth’s heat “Science Stats” (SN: 8/27/11, p. 4) understates the power Earth radiates into space and mistakenly suggests that Earth radiates more energy from internal sources than it receives from the sun. The total (44 trillion watts) shown in your diagram must represent only the minuscule percentage (about 0.02 percent) from internal energy […]

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  4. SN Online

    ENVIRONMENT Plastics sloughed off clothing can pollute coastlines.