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. (CES) Carl Edward Sagan
  3. (RDB) Ray Douglas Bradbury
  4. (NASA) National Aeronautics and Space Administration

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