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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