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  1. Health & Medicine

    Some South American rodent-borne viruses may spread as climate warms

    Some rodents in South America carry arenaviruses and hantaviruses. Climate change may bring both to regions where neither is currently a threat.

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  2. Psychology

    Yawning is contagious — even in the womb

    Rather than catching a yawn on sight, muscles squeezing the uterus could be the trigger for a fetus to catch a yawn from its mother.

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  3. Paleontology

    If wings came before flight, what were they for?

    Scientists use simulated dinosaurs to trigger real insect brains and test how wings originally evolved.

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  4. Particle Physics

    To understand black holes, physicists turn to a mathematical ‘Rosetta stone’

    A link between particle physics and gravity equations, called the double copy, applies to Hawking radiation, creating a new way into black hole puzzles.