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...Sir W. P. in 1682, stated at only 320 millions, has been estimated by some writers at about 730 million, by others, at upwards of 900 million; Mr. W ...//web.archive.org/web/20130722230538/http://science.nationalgeographic.com/science/health-and-human-body/human-diseases/plague-article.html |archive-date=22 J ...

...den|title=Geometry and Algebra in Ancient Civilizations|publisher=Springer Science & Business Media|year=2012|page=26}}</ref> Carl Boyer states that the Pytha ...ence exists that it was actually discovered by him. The comparatively late writers who attribute it to him add the story that he sacrificed an ox to celebrate ...