Uncategorized

  1. Paleontology

    50-million-year-old fossil sperm discovered

    Ancient worm sperm preserved in 50-million-year-old cocoons from Antarctica set age record.

    By Meghan Rosen
  2. Particle Physics

    LHC reports pentaquark sightings

    Two particles discovered at the Large Hadron Collider are composed of five quarks, not two or three like nearly every other known quark-based particle.

    By Andrew Grant
  3. Life

    The origin of biological clocks

    Most of Earth’s creatures keep time with the planet’s day/night cycle. Scientists are still debating how and why the circadian clocks that govern biological timekeeping evolved.

    By Tina Hesman Saey
  4. Animals

    Some animals’ internal clocks follow a different drummer

    Circadian clocks in some animals tick-tock to a different beat.