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  1. Restricting calories keeps immune system young

    Drastic limits on calorie consumption starting early in a monkey’s life seemed to delay aging of the animal’s immune systems in new research. Numerous studies have found that calorie restriction can extend the life span of organisms such as yeast, worms, fruit flies, and mice. However, scientists don’t know how caloric restriction lengthens life. Janko […]

    By Christen Brownlee
  2. Planetary Science

    Signs of recent water on Mars

    Pictures showing fresh deposits of bright material on two Martian gullies provide the most compelling evidence yet that water flowed on parts of the Red Planet during the last few years.

    By Ron Cowen
  3. Tech

    Shape shifter shifts twice

    Certain plastics known as shape-memory polymers switch to predetermined shapes when triggered by heat or light.