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  1. Health & Medicine

    Keeping the beat

    Muscle cells taken from embryonic rats and put into an adult rat's heart can transmit the electric signals that govern the heartbeat.

    By Damaris Christensen
  2. Tech

    Robotic heart surgery

    By using robotic rather than conventional open-heart techniques, doctors can perform heart surgery with smaller incisions, giving patients less pain and speeding recovery.

    By Damaris Christensen
  3. Health & Medicine

    Enzyme Shortage May Lead to Lupus

    Without the enzyme DNase I, mice are vulnerable to symptoms of lupus, a debilitating autoimmune disease.

    By Nathan Seppa
  4. Math

    Five-Suit Decks, Traffic-Jam Puzzles, and Other Treats

    Tired of playing the same old card games with the same old cards? One option is to expand the deck to include five suits instead of just four.