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  1. Animals

    Finch Concerts: Female bird brain notes male attention

    Male zebra finches sing slightly differently when serenading a female as opposed to twittering to themselves, and females react to those differences.

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  2. Animals

    Love Code: A twist of light only mantis shrimp can see

    Alone in the animal kingdom, these crustaceans signal their presence to potential mates with circularly polarized light.

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  3. Health & Medicine

    Bad Blood? Old units might be substandard

    Heart patients who get transfusions of donated blood that's kept more than 14 days fare worse than patients who get fresher blood.

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  4. People move like predators

    Cell phone data shows that people's daily roaming follows statistical patterns also seen in predators.