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  1. Earth

    Dry sand can bubble and swirl like a fluid

    Put two types of sand grains together in a chamber, and they can flow like fluids under the right conditions.

    By Carolyn Gramling
  2. Astronomy

    Skepticism grows over whether the first known exomoon exists

    New analyses of the data used to find the first discovered exomoon are reaching conflicting results.

    By Lisa Grossman
  3. Health & Medicine

    A mysterious dementia that mimics Alzheimer’s gets named LATE

    An underappreciated form of dementia that causes memory trouble in older people gets a name: LATE.

    By Laura Sanders
  4. Physics

    Here’s what causes the aurora-like glow known as STEVE

    Amateur astronomer images and satellite data are revealing what causes the strange atmospheric glow called STEVE.