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So how did they determine that Piltdown Man is a fraud? Care to explain? From what I know, no one ever came forward and admitted that they faked it.
Wikipedia is your friend:
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From the outset, there were scientists who expressed skepticism about the Piltdown find. G.S. Miller, for example, observed in 1915 that "deliberate malice could hardly have been more successful than the hazards of deposition in so breaking the fossils as to give free scope to individual judgment in fitting the parts together." In the decades prior to its exposure as a forgery in 1953, scientists increasingly regarded Piltdown as an enigmatic aberration inconsistent with the path of hominid evolution as demonstrated by fossils found elsewhere.[1] Skeptical scientists only increased in number as more fossils were found.
In November 1953, The Times published evidence gathered variously by Kenneth Page Oakley, Sir Wilfrid Edward Le Gros Clark and Joseph Weiner proving that the Piltdown Man was a forgery[citation needed] and demonstrating that the fossil was a composite of three distinct species. It consisted of a human skull of medieval age, the 500-year-old lower jaw of a Sarawak orangutan and chimpanzee fossil teeth. The appearance of age had been created by staining the bones with an iron solution and chromic acid. Microscopic examination revealed file-marks on the teeth, and it was deduced from this someone had modified the teeth to give them a shape more suited to a human diet.
The Piltdown man hoax had succeeded so well because at the time of its discovery, the scientific establishment had believed that the large modern brain had preceded the modern omnivorous diet, and the forgery had provided exactly that evidence. It has also been thought that nationalism and cultural prejudice also played a role in the less-than-critical acceptance of the fossil as genuine by some British scientists.[4] It satisfied European expectations that the earliest humans would be found in Eurasia, and the British, it has been claimed,[4] also wanted a first Briton to set against fossil hominids found elsewhere in Europe, including France and Germany.