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  1. Space

    Spacecraft in 2021 set their sights on Mars, asteroids and beyond

    This year, a bevy of new missions got under way on Mars and spacecraft prepared to visit asteroids.

    By Lisa Grossman
  2. Climate

    How electric vehicles offered hope as climate challenges grew

    Amid daunting climate change challenges, electric vehicles swerved into the spotlight this year.

    By Carolyn Gramling
  3. Space

    These discoveries from 2021, if true, could shake up science

    Discoveries in 2021, from hidden subatomic particles to the oldest animal fossils, could shake up science. But more evidence is needed to confirm them.

    By Aina Abell
  4. Animals

    A 1,306-legged millipede is the first to live up to its name

    Scientists have discovered the first true millipede, an elongated, threadlike creature with a whopping 1,306 legs.