The Case of the
Here's another clue:
"Didn't you tell me that UFO's had been around as far back as
1800?" asked Max.
"Oh yes," said Nina. "This one professor said it could be even
farther back. Why?"
"Well, Sam Cartland said they had only been reported since 1947.
That's only 51 years ago."
"Oh, oh," said Nina. "That part about seeing them way back came at
the very end of the show. Do you suppose?"