Popper, Searle and Hildegard: who vouches for what we claim to know
Karl Popper died on 17 September 1994, John Searle on the same date in 2025, Hildegard of Bingen in 1179. Thirty-nine men signed a constitution in Philadelphia on the day in 1787. Each answered the same question differently: when someone claims to know, who or what stands behind the claim?
Newsroom · 17 September 2026 · John Searle, Karl Popper








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