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  1. Health & Medicine

    Immune cells show long-term memory

    Survivors of the 1918 Spanish flu pandemic still make antibodies against the virus, revealing a long-lived immunity previously thought impossible.

    By Tina Hesman Saey
  2. Space

    The great planet debate

    New suggestions for defining a planet would put Pluto back on the list. Scientists discuss the International Astronomical Union’s definition during the Great Planet Debate Conference.

    By Ashley Yeager
  3. Math

    Do subatomic particles have free will?

    Math Trek: If we have free will, so do subatomic particles, mathematicians claim to prove.

    By Julie Rehmeyer

  4. Hidden Harmony: The Connected Worlds of Physics and Art

    by J.R.