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  1. Environment

    Earth’s oldest known wildfires raged 430 million years ago

    430-million-year-old fossilized charcoal suggests atmospheric oxygen levels of at least 16 percent, the amount needed for fire to take hold and spread.

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  2. Microbes

    This giant bacterium is the largest one found yet

    On average, Thiomargarita magnifica measures 1 centimeter long and maxes out at 2 centimeters. It is 50 times larger than other giant bacteria.

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  3. Paleontology

    Vampire squid are gentle blobs. But this ancestor was a fierce hunter

    New fossil analyses of 164-million-year-old ancestors of today’s vampire squid show the ancient cephalopods had muscular bodies and powerful suckers.

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  4. Chemistry

    Cats chewing on catnip boosts the plant’s insect-repelling powers

    When cats tear up catnip, it increases the amount of insect-repelling chemicals released by the plants.

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  5. Astronomy

    An otherwise quiet galaxy in the early universe is spewing star stuff

    Seen as it was 700 million years after the Big Bang, the galaxy churns out a relatively paltry number of stars. And yet it’s heaving gas into space.

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  6. Physics

    Physicists may have finally spotted elusive clusters of four neutrons

    Long-sought clumps of four neutrons called tetraneutrons last less than a billionth of a trillionth of a second, an experiment suggests.

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  7. Astronomy

    Gravitational wave ‘radar’ could help map the invisible universe

    Gravity ripples scattering off warped spacetime near massive objects might help astronomers peer inside stars and find globs of dark matter.

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  8. Science & Society

    Russia’s invasion could cause long-term harm to Ukraine’s prized soil

    War will physically and chemically damage Ukraine’s prized, highly fertile chernozem soils. The impacts on agriculture could last for years.

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  9. Physics

    How fast a row of dominoes topples depends on friction

    Computer simulations reveal that two types of friction are important in determining how quickly dominoes collapse.

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  10. Astronomy

    Seven newfound dwarf galaxies sit on just one side of a larger galaxy

    Seven newly found dwarf galaxy candidates are stick to just one side of the large galaxy M81. Astronomers don’t know why.

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  11. Health & Medicine

    Western wildfires’ health risks extend across the country

    As western wildfires become more common, hazardous smoke is sending people — especially children — to emergency rooms on the East Coast.

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  12. Health & Medicine

    Pfizer’s and Moderna’s COVID-19 vaccines are OK’d for the youngest kids

    Babies, toddlers and preschoolers could begin getting immunized against COVID-19 as early as June 21 in the United States.

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