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  1. Health & Medicine

    Deadly Pickup: Enzyme permits plague germ to ride in fleas

    Acquisition of a gene that enables the plague bacterium to live inside blood-sucking fleas may have set the stage for the Black Death.

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  2. Earth

    The Silent Type: Pacific Northwest hit routinely by nonquakes

    Once every 14 months or so, portions of coastal British Columbia and northwestern Washington State experience a slow ground motion that, if released all at once, would generate an earthquake measuring more than 6 on the Richter scale.

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  3. Astronomy

    Super Wallops: Tracking the origin of cosmic rays

    Two new studies shed light on the longstanding mystery of where cosmic rays—the energetic charged particles that bombard our galaxy—originate.