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  1. Humans

    How testing improves memory

    By creating associations, quizzes improve recall much more effectively than just reviewing notes.

    By Marissa Cevallos
  2. Psychology

    Getting to not know you

    Knowledge of a romantic partner’s likes and dislikes declines over decades, a study finds.

    By Bruce Bower
  3. Space

    Existence of habitable exoplanet questioned

    A Swiss team has failed to confirm what has recently been claimed to be the first planet outside the solar system that might be right for life.

    By Ron Cowen
  4. Chemistry

    Guards of the blood-brain barrier identified

    Specialized cells called pericytes are crucial to protecting the central nervous system, two new studies demonstrate.