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  1. Handsome blue tit dads have more sons

    A female blue tit with a particularly dashing mate is more likely to have sons than is a female matched with a ho-hum guy.

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  2. Earth

    The Importance of Being Electric

    By coordinating measurements from telescopes, planes, balloons, and a battery of instruments, terrestrial and space scientists have now placed themselves on almost intimate terms with sprites—luminous shapes that fleetingly appear high above lightning storms.

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  3. Health & Medicine

    Boning Up

    Biologists have discovered a mechanism for communication between two types of bone cell, and they're exploring the possible bone-growth-stimulating effect of popular cholesterol-lowering drugs called statins.

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  4. Animals

    Marine Mules: Near-sterile hyrids boost coral diversity

    Reef corals that spawn in great mixed-up soups of many species may be maintaining their diversity because their hybrids are sterile mules.