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  1. Anthropology

    Siberians came to North American Arctic in two waves

    Siberian ancestors of the modern-day Inuit replaced a 4,000-year-old North American Arctic culture, a DNA study reveals.

    By Bruce Bower
  2. Health & Medicine

    Human tests of experimental Ebola vaccine set to start

    NIH and NIAID have announced that human tests of an experimental vaccine against Ebola virus will begin in early September.

    By Nathan Seppa
  3. Health & Medicine

    To grow new knee cartilage, look to the nose

    Cartilage-making cells from the nose grew into patches that successfully replaced damaged or missing cartilage in the knees of goats and of humans.

    By Nathan Seppa
  4. Astronomy

    Wake of nearby supernova hints at explosion’s origins

    Gamma rays from radioactive decay of cobalt formed in a nearby supernova reveal unprecedented details of the explosion’s aftermath.