Clue: Billion-year period

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Last Seen In:

  • USA Today - June 24, 2024
  • USA Today - February 02, 2022
  • USA Today - November 09, 2021
  • USA Today - June 25, 2021
  • Netword - May 07, 2021
  • USA Today - January 21, 2020
  • Universal - September 06, 2019
  • LA Times - February 01, 2012
  • Netword - June 09, 2007

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