Geek Trivia: What Subtle Message Does Mars Rover Curiosity’s Wheels Leave Behind?

What Subtle Message Does Mars Rover Curiosity’s Wheels Leave Behind?
  1. (JPL) Jet Propulsion Lab
  2. (RDB) Ray Douglas Bradbury
  3. (NASA) National Aeronautics and Space Administration
  4. (CES) Carl Edward Sagan

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