Some 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 five 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 five and a half years ago
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