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 73 million, four years, and six months

"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 seventy three million
years old when I started working here, and that was four and a half
years ago."
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