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  1. Health & Medicine

    Visualizing Cancer: Images of tumors can detect gene expression

    Subtle features in X-ray images of tumors let radiologists infer which genes are active in the cancerous growth.

    By Patrick Barry
  2. Animals

    Pothole Pals: Ants pave roads for fellow raiders

    By throwing their bodies into tiny potholes on rough trails, army ants enable their comrade to race over them, improving the colony's overall foraging success.

    By Susan Milius
  3. Health & Medicine

    Early Start: Fetuses generate immune response to vaccination

    A fetus can manufacture immune cells and antibodies in direct response to vaccine given to the mother during pregnancy.

    By Nathan Seppa
  4. Earth

    Ice Age Ends Smashingly: Did a comet blow up over eastern Canada?

    An extraterrestrial object apparently exploded above Canada about 12,900 years ago, sparking devastating wildfires and triggering a millennium-long cold spell.