One of the prizes offered for solving a problem recorded in the Scottish Book was a live goose.
Notes on verification
Confirmed by multiple independent sources including Per Enflo's personal account, Wikipedia articles on Mazur and the Scottish Book, and an academic survey paper on the Scottish Book's history. [tier=silver indep_score=0.925 clusters=2 claim_tier=notable]
Sources
- List of mathematics history topics (wikipedia)
- https://perenflo.com/publications (corroboration)
- https://arxiv.org/pdf/2603.27867 (corroboration)