Museum trip

I went to the Natural History Museum and asked how old the T-Rex skeleton was.
The curator said, "66 million and seven years."
I said, "How can you be so accurate?"
He replied, "When I started working here they told me
The curator said, "66 million and seven years."
I said, "How can you be so accurate?"
He replied, "When I started working here they told me
Spoiler: