While admiring some dinosaur bones in the Museum of Natural History, a tourist asks the guard, "How old are they?" The guard replies, "They are 73 million, four years, and six months old." "That's a rather exact number," says the tourist. "How do you know their age so precisely?" "Well," answers the guard, "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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