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  1. Neuroscience

    A brain chemical tied to narcolepsy may play a role in opioid addiction

    Long-term use of opioids such as heroin is linked to having more brain cells that release a chemical that regulates wakefulness and arousal.

    By Laurel Hamers
  2. Planetary Science

    Mars got its crust quickly

    The Martian crust had solidified within 20 million years of the solar system’s formation.

    By Carolyn Gramling
  3. Health & Medicine

    How to make CAR-T cell therapies for cancer safer and more effective

    CAR-T cell therapy was approved by the FDA in late 2017. Now, scientists are working to tame the cancer treatment’s side effects.

    By Laurel Hamers
  4. Genetics

    Readers ponder geothermal power and more

    Readers respond to stories from the May 26, 2018 issue of Science News.