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  1. Health & Medicine

    Low birth weight matters later, too

    Premature babies weighing less than 1.5 kilograms at birth grow up to have lower achievement scores on standard tests and are less likely to go to college than are full-term babies weighing more than twice as much.

    By Nathan Seppa
  2. Math

    A Snowy Twist

    Carving a massive block of packed snow into an elegant sculpture presents all sorts of challenges. It’s even tougher when the goal is an intricate mathematical shape with a gravity-defying heart. A Twist in Time. Photo by Stan Wagon Eltanin by Bathsheba Grossman. On display at the northeast corner of 33rd and Walnut St., University […]

    By Ivars Peterson
  3. Chemistry

    A new molecule and a new signature

    In two independent discoveries, chemists have prepared a new form of nitrogen and captured the infrared spectrum of an unusual molecule made up of hydrogen and oxygen.