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  1. Astronomy

    A reappearing supernova offers a new measure of the universe’s expansion

    Supernova Refsdal blew up once but burst into view at least five times. The timing of its appearances provides clues to how fast the universe is growing.

    By James R. Riordon
  2. Paleontology

    ‘Thunder beast’ fossils show how some mammals might have gotten big

    Rhinolike mammals called brontotheres repeatedly evolved into bigger and smaller species, a fossil analysis shows. The bigger ones won out over time.

    By Elise Cutts
  3. Animals

    Why some hammerhead sharks seem to ‘hold their breath’ during dives

    Scalloped hammerhead sharks in Hawaii seem to limit the use of their gills during deep dives to prevent losing heat to their surroundings.