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  1. Body & Brain

    Pack-a-day smoking habits are on the wane, plus Haitian cholera and omega-3s in this week’s news.

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  2. Archaeology

    Pueblo traded for chocolate big-time

    New evidence of ancient Pueblo cacao drinking feeds a theory of long-distance trade.

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  3. Humans

    Record ozone thinning looms in Arctic

    Depletion could expose the northern midlatitudes to higher-than-normal ultraviolet radiation in coming weeks.

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  4. Earth

    Cave formations record Black Sea deluges

    Stalagmites in a Turkish grotto document 670,000 years of flooding.

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  5. Astronomy

    New study gives dark energy a boost

    Measurements provide further evidence for a cosmic push that is accelerating the expansion of the universe.