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  1. Life

    The ‘Blob,’ an unprecedented marine heat wave, killed 4 million seabirds

    Millions of other animals may have perished too, suggesting the die-off event might be one of the worst in modern times.

    By Jake Buehler
  2. Genetics

    Neandertal genes in people today came from hook-ups around 47,000 years ago

    Most present-day humans carry a small amount of Neandertal DNA that can be traced back to a single period of interbreeding, two genetic analyses find.

    By McKenzie Prillaman
  3. Health & Medicine

    These are the viruses that defined 2024

    Here’s the latest on mpox, bird flu, dengue and other viral outbreaks that flared up this year.

    By Erin Garcia de Jesús
  4. Earth

    Earth’s inner core may be changing shape

    Earthquake data suggest that all or small patches of the inner core's surface may be swelling and contracting.