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  1. Where do we draw the line between life and death?

    Editor in chief Nancy Shute writes about the challenges of defining brain death and the first GM mosquitoes in the United States.

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  2. Readers ask about neutrinos in the sun’s core, megaflashes and mussels

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  3. Ecosystems

    Protecting half the planet could help solve climate change and save species

    An analysis lays out where new land protections could complement existing protected areas to achieve various conservation and climate goals.

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  4. Life

    This parasitic plant eavesdrops on its host to know when to flower

    Dodder plants have no leaves to sense when to bloom, so the parasites rely on a chemical cue from their hosts instead.