News

  1. Life

    Slow sperm may fail at crashing ‘gates’ on their way to an egg

    A new study describes how sperm navigate narrow straits in the reproductive tract’s obstacle course to reach an egg.

    By Aimee Cunningham
  2. Planetary Science

    After 15 years on Mars, it’s the end of the road for Opportunity

    After 15 years of exploring Mars, a dust storm led to the demise of NASA’s longest-lived rover.

    By Lisa Grossman
  3. Quantum Physics

    Photons reveal a weird effect called the quantum pigeonhole paradox

    Quantum particles seem to disobey a fundamental principle of mathematics.

    By Emily Conover
  4. Health & Medicine

    Congo’s Ebola outbreak is a testing ground for new treatments

    The first multidrug clinical trial of Ebola treatments is underway amid an outbreak in Congo.