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  1. Quantum Physics

    A tiny version of this physics toy is revealing quantum secrets

    Scientists created a quantum Newton’s cradle to study thermal equilibrium.

    By Emily Conover
  2. Tech

    50 years ago, a Japanese scientist dreamed up a rocket-propelled train

    50 years ago, a Japanese engineer tried rocket boosters on a train. Today, high-speed trains propelled by superconducting magnets are being tested.

    By Bethany Brookshire
  3. 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
  4. Planetary Science

    Mars got its crust quickly

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