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  1. Physics

    Quantum Pileup: Ultracold molecules meld into oneness

    Scientists have for the first time transformed molecules into an exotic state of matter called a Bose-Einstein condensate.

    By Peter Weiss
  2. Earth

    Pieces of a Pulverizer? Sediment fragments may be from killer space rock

    Scientists sifting sediments laid down just after Earth's most devastating mass extinction 250 million years ago may have found minuscule fragments of the extraterrestrial object that caused the catastrophe.

    By Sid Perkins
  3. Health & Medicine

    Rebuilding the Heart: Marrow cells boost cardiac recovery

    Inserting a person's own bone marrow stem cells into an ailing heart via a catheter can improve heart and lung function in such patients.