"Class Trip" joke

A student on a class trip to the natural-history museum asks the guard, "Can you tell me how old the dinosaur bones are?"
The guard tells him, "Three-million-four years and six months old."
The student says. "How do you know that so precisely?"
The guard says, "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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