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 A tourist was visiting New Mexico and was amazed at the dinosaur bones lying about. 
 
 How old are these bones? the tourist asked an elderly Native American, who served as a guide. 
 
 Exactly one hundred million and three years old. 
 
 How can you be so sure? inquired the tourist. 
 
 Well, replied the guide, a geologist came by here and told me these bones were one hundred million years old, and that was exactly three years ago. 
 
 
 
 
 
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