Chicago Museum of Natural HistorySome tourists in the Chicago Museum of Natural History are marveling at the dinosaur bones. One of them asks the guard: ``Can you tell me how old the dinosaur bones are?'' The guard replies, ``They are 3 million, four years, and six months old'' ``That's an awfully exact number'', says the tourist '`How do you know their age so precisely?'' The guard answers, ``Well, the dinosaur bones were three million years old when I started working here, and that was four and a half years ago''
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