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  1. Health & Medicine

    What the new nutrition guidelines get wrong about fat

    New U.S. dietary guidelines promote eating full-fat foods and meats. But experts say nuts and seed oils are better sources of the two crucial fats we need.

    By Tina Hesman Saey
  2. Health & Medicine

    The brain’s response to a heart attack may worsen recovery

    In mice, blocking heart-to-brain signals improved healing after a heart attack, hinting at new targets for cardiac therapy.

    By Alessio Cozzolino
  3. Animals

    Spider silk-making organs evolved due to a 400-million-year-old genetic oops

    An ancient ancestor of spiders and relatives doubled its genome about 400 million years ago, setting the stage for the evolution of spinnerets.