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  1. Earth

    Japan’s 2011 earthquake upped Tokyo’s risk

    Chance more than doubled that capital city will soon experience big temblor, researchers calculate.

    By Erin Wayman
  2. Life

    Exploration forges differences in identical twins

    Mice with the same genes and surroundings diverged in brain development depending on how much they moved around their environment.

    By Puneet Kollipara
  3. Space

    Moon’s water may have earthly origins

    Ratio of hydrogen to deuterium suggests molecule on both orbs has a common source.

    By Andrew Grant
  4. Earth

    The Arctic was once warmer, covered by trees

    Pliocene epoch featured greenhouse gas levels similar to today's but with higher average temperatures.