{"slug":"thinker-charles-darwin","verification":{"valid":false,"broken_at":1,"reason":"hash mismatch"},"count":2,"sources":[{"id":"s1","type":"other","url":"https://darwin-online.org.uk/content/frameset?itemID=F373&viewtype=text&pageseq=1","title":"On the origin of species by means of natural selection (1859 first edition)","quote":"Owing to this struggle for life, any variation, however slight and from whatever cause proceeding, if it be in any degree profitable to an individual of any species...","summary":"Full text of the 1859 edition establishing publication details and the selection mechanism.","claim_ids":["c1","c2","c3"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-07T07:32:53.824Z","link_status":"ok","quote_status":"unverified","prev":"genesis","hash":"c16d9147a25a0e41b2f10aee9ff2ea120bb84dbf4d4ae9719d6f66a6968e54f5"},{"id":"s2","type":"other","url":"https://en.wikipedia.org/wiki/On_the_Origin_of_Species","title":"On the Origin of Species","quote":"It was published on 24 November 1859 (John Murray).","summary":"Confirms publication date and publisher from the historical record.","claim_ids":["c1","c2"],"found_by":"grok/grok-4.3","extra":{},"accessed_at":"2026-07-07T07:32:53.824Z","link_status":"ok","quote_status":"unverified","prev":"c16d9147a25a0e41b2f10aee9ff2ea120bb84dbf4d4ae9719d6f66a6968e54f5","hash":"c288399be0d5a760e187e7ff959b0dfded2e89aa42404af52425b6d6649223f4"}]}