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  1. Earth

    An ancient Earth impact could help in the search for Martian life

    Strange cone-shaped rocks led scientists to the hidden remains of one of Earth’s oldest asteroid impacts. It could help us find fossil life on Mars.

    By Douglas Fox
  2. Oceans

    Deep-sea mining could start soon — before we understand its risks

    The U.S. push to mine international waters for metals defies global efforts to control and protect these fragile ecosystems.

    By Carolyn Gramling
  3. Health & Medicine

    These 5 nutrients might be lacking in your diet

    U.S. diets should include more of vitamins D and E, fiber, calcium and magnesium — all are essential nutrients that could offer health benefits.