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A suggestion that there may be a straightforward determination of facts via a blood test: https://www.connexionfrance.com/French-news/DNA-blood-test-could-reve

• gwern 7y ago
  A special case, though. Almost all centenarians wouldn't admit of such a solution - at least, until we start getting whole population pedigrees and then an inability to put a centenarian in the appropriate place becomes proof of error/fraud.