RAY: This puzzler was from the World War II series. The inspiration was sent in by Todd Markin, but I had to unclarify it for everybody, so here it is.
Close your eyes and imagine this. It's 1944, D-Day is approaching. Operation Overlord, the Normandy invasion is just days away. But only a select few know how many. Now it's vitally important that the location of German troop concentrations and munitions dumps be communicated to the Allied command in England. Perhaps even more important the French resistance fighters much now be put to work. Rail lines and bridges need to be taken out, and the timing is critical.
Radio communication is too risky. Information must be exchanged in person. To that end a small boat leaves England headed for the French coast. Two robust young men quietly work the oars, there's no moon this night and the thick overcast has an unexpected yet welcome measure of security. The third man in the boat is too old and feeble to be of much use rowing, he works the signal light as they near the shore. Three quick flashes follow by a pause, and then two flashes. His counterpart, a retired cavalryman, a veteran of the First World War is hunkered down in the sand on the French coast. He signals three quick flashes with his light, the all clear to come ashore.
The men quickly exchange documents and in an instant they're gone.
TOM: Do they stop for coffee?
RAY: No, Monsieur. The Frenchmen disappear into the English Channel.
TOM: I knew you'd work it in.
RAY: The three in the boat swiftly and quietly rowing back to Mother England. But here's the interesting part. There were lots of German soldiers on shore patrol, each with the keen eyesight of young men. Yet none of them saw the flashing signals. The question is, why. And I think I gave the hint that the old men.
TOM: Are dancing girls involved?
RAY: Well, in your version of it. Now even though Todd Markin's letter was really convincing I didn't trust him. I mean I've been embarrassed so many times before with puzzlers that sounded so good, I had to consult my pal, Dr. Paul Vinger who's an ophthalmologist to find out if in fact this answer was legit.
TOM: Or --
TOM: AND RAY: Bo-oh-oh-gus.
RAY: And as you might suspect, the old men were critical because they had had something done to them that only old people have. They had had cataract surgery. And when you have cataracts removed, the lens is removed because the lens is what's gotten cloudy. And what the lens does is it filters out ultraviolet light. So when the lens is removed on those people who have had the surgery, they can now see ultraviolet light, and of course the young German soldiers -- none of whom had ever had cataract surgery -- could not see the light.
TOM: Wow.
RAY: So who's our winner?
TOM: The winner is Melissa Laird from Missoula, Montana.
[ Car Talk Puzzler ]
