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The interest in Rontgen’s discovery would launch the second scientific revolution; the first being launched by the work of Galileo (Asimov, 1984, pp 514-515).In 1896 Rontgen demonstrated the use of X-rays to view skeletal structure by taking a picture of the German biologist Rudolf Albert von Kolliker’s (1817-1905) hand.Once this energy was discovered a new, successful strategy called radiometric dating would be developed.Today radiometric dating places absolute dates on the relative time scale.

Paleoanthropologists and archaeologists must always be aware of possible radiocarbon sample contamination that could result in inaccurate dates.We stick the garden hose in and turn it on full blast.The water coming out of the hose is analogous to the continuous production of carbon-14 atoms in the upper atmosphere.The barrel represents the earth's atmosphere in which the carbon-14 accumulates.The water leaking out the sides of the barrel represents the loss (mainly by radioactive decay) of the atmosphere's supply of carbon-14.

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