Professor Popper's Falsification Pumice Bar

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Earliest known poster for Professor Popper's Falsification Pumice Bar.

Professor Popper's Falsification Pumice Bar is a mental hygiene product derived from the philosophies of Karl Popper (nonfiction).

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  • Post @ Twitter (21 August 2023)
  • Post @ Twitter (21 January 2023)
  • Post @ Twitter (10 November 2022)