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  1. 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
  2. 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. To solve this difficult Rush Hour puzzle, you must move vehicles out of the way to permit the red car to exit at right. The best known […]

    By Ivars Peterson
  3. Health & Medicine

    Cycling and surgery have similar effect

    Among people with chest pain because of clogged heart arteries, regular exercise on a stationary bike reduced symptoms better than surgery did.