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  1. Health & Medicine

    Obesity linked to pancreatic cancer

    People who are obese or who have led sedentary lives with little exercise are more likely than others to develop pancreatic cancer.

    By Nathan Seppa
  2. Tech

    Designing planet rovers that tumble

    Before the decade is out, towering wind-driven balloons may roam the Martian surface, traveling far more extensively than wheeled rovers do.

    By Peter Weiss
  3. Tech

    Futuristic engine proves its mettle

    A miniature missile shot from a cannon has demonstrated for the first time in free flight that a futuristic jet engine called a scramjet can propel itself.

    By Peter Weiss
  4. Earth

    Quantum physics explains core anomaly

    Scientists have used the principles of quantum physics to answer the long-standing puzzle of why seismic waves travel at different speeds in different directions across Earth's inner core.