Feature

  1. Health & Medicine

    Blood, Iron, and Gray Hair

    Recent findings show that anemia is exceedingly common in elderly people and link the condition to severe health problems, including accelerated physical and mental decline and a shorter life span.

    By Ben Harder
  2. Tech

    Quantum-Dot Leap

    Multiple electrons from photons in quantum dots could be a boon to solar cells and other technologies.

    By Peter Weiss

  3. Light Impacts

    Depending on when it's encountered, blue light can be more effective than other hues (or even white light) at waking people, setting their biological clocks, and maximizing visual acuity.

    By Janet Raloff

  4. Violent Developments

    New research has identified a spectrum of interacting elements that contribute to impulsive violence in young people.