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  1. Earth

    How ancient oceans of magma may have boosted Earth’s oxygen levels

    Chemical reactions involving iron could have increased the amount of oxygen-rich compounds in the early Earth’s mantle, lab experiments suggest.

    By Maria Temming
  2. Space

    Overnight changes in Mars’ atmosphere could solve a methane mystery

    Overnight atmospheric changes on Mars can explain why two spacecraft measure vastly different concentrations of methane.

    By Lisa Grossman
  3. Life

    Human meddling has manipulated the shapes of different dog breeds’ brains

    By analyzing the shape of different dog breeds’ brains, researchers show how humans have manipulated the animals’ brain anatomy.

    By Laura Sanders
  4. Life

    Fly fossils might challenge the idea of ancient trilobites’ crystal eyes

    Fossilized crane flies from 54 million years ago probably got their crystal lenses after death.