Two very different things stopped proving themselves on the same day in September 2022.
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Federer and the Merge 2
2022Ethereum moves to Proof of StakeThe Merge cuts energy use by 99.9%Ethereum completed its transition from energy-intensive Proof of Work to Proof of Stake consensus on September 15, 2022 — "The Merge". It reduced Ethereum's energy consumption by approximately 99.95%.
2022Roger Federer announces retirementLaver Cup, London — final matchOn 15 September 2022, Roger Federer announced his retirement from professional tennis after 24 years and 1,500+ matches. His final match was a doubles match at the Laver Cup alongside Rafael Nadal. Both were in tears at the end. Federer retired with 20 Grand Slam titles, 103 ATP titles, and 310 weeks as world number 1.