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  1. Health & Medicine

    Testing mosquito pee could help track the spread of diseases

    A new way to monitor the viruses that wild mosquitoes are spreading passes its first outdoor test.

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  2. Life

    50 years ago, scientists were unlocking the secrets of bacteria-infecting viruses

    In 1969, a bacteria-infecting virus held promise for unlocking the secrets of viral replication. Fifty years later, the virus is a versatile tool for scientists.

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  3. Life

    How emus and ostriches lost the ability to fly

    Changes in regulatory DNA, rather than mutations to genes themselves, grounded some birds, a study finds.

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  4. Astronomy

    This planetary remnant somehow survived the death of its sun

    A small, sturdy piece of planet survived the collapse of its sun and now orbits the dead star.