They Couldn't Detect It For Years

"Have you ever heard of a radar detector?"

"How about a radar detector detector, which the police use to see if you have a detector?"

"Ever wonder how they work?"

"I mean, a radar detector is a receiver, how could the police possibly know you have one?"

"Until recently, practically every radio used a concept called superheterodyne."

"Basically there’s a tiny radio transmitter in your receiver, that signal is mixed with the one from the antenna and the result is what your receiver tunes to."

"It's one of the most important inventions of the 20th century, and you most likely never heard of it."

"The problem is that sometimes the tiny transmitter is poorly shielded and some of it leaks back out the antenna."

"If you know what that 'intermediate frequency' is you can listen for it."

"The Escort radar detectors, which were super-popular in the 80's, leaked like a sieve.""Presto, radar detector detectors."

"Takeaway: if you know what you're looking for, you can actually detect someone else's radio receiver."

"The setup."

"In 1942 RAF planes began using VHF radar to look for German submarines leaving port in France at night."

"All of a sudden they were getting sunk en mass."

"The Germans were familiar with other British radars working around this frequency and were able to find the new radar's frequency around August."

"They built a receiver, Metox, which was tuned to this frequency."

"When a plane using this radar was anywhere in the area, Metox would play a sound into the radio operator's headphones."

"By October most of the fleet had it and the RAF pilots were returning with stories about how the uboats would always dive as soon as they turned toward them to attack."

"But the RAF had prepared for this moment, they knew it was only a matter of time before the Germans found the frequency."

"Earlier two grad students had come up with a new device called the magnetron that produced very strong radio signals from a device the size of a breadbox."

"And the signal was REALLY short, about 10 cm, whereas their older radars were 150."

"So Metox was completely incapable of 'hearing' it, it was tuned way too far from the frequency of the new signal."

"They rushed the new system into production and the first sets started arriving just in time for the uboat campaign to start up again in spring when the weather got better."

"By March it was clear to the Germans something was up."

"Their boats were getting sunk en mass again, and the ones that escaped attack said there was no warning on their detectors."

"They tried everything to detect the new signal, but they just couldn’t find it."

"This was because they were missing one extremely important bit of electronics, the crystal detector, and simply couldn’t hear the signals no matter how hard they tried."

"And now the lie."

"Knowing something was up, uboats were on high alert all the time."

"One got lucky and shot down its attacker, and captured the crew."

"During interrogation they asked why they could no longer detect the radar."

"The pilot told them they no longer used radar. Instead, he claimed, they had a receiver for Metox and under perfect conditions they could pick it up 90 miles away."

"They only turned on the radar at the last minute for range measurements so they knew when to drop the depth charges."

"By that time the U-boat was too busy exploding to notice."

"The Germans didn’t believe him, but it was technically possible, once can indeed make a receiver to detect your receiver."

"And Metox was known to be 'leaky', as it was deliberately built quick and cheap from a pre-war French radio set."

"So they built their own Metox receiver in the lab, and sure enough, they could detect it."

"So then they put it on a plane and detected one of their boats 60 miles away."

"Utter panic."

"Orders were sent out to all boats: turn off Metox."

"And so not only did the RAF get to keep using their fancy new magnetron radar without the Germans even trying to detect it, but then they turned off their perfectly good Metox detectors and all the RAF planes with the older radar suddenly started working again too!"

"And THAT is the greatest lie ever."

"By the end of June, the uboat fleet was on the bottom of the ocean."

"This was not due entirely to this trick, there were a number of things that all arrived at almost the same time that did it."

"It was the combination of the new radars, huff-duff, larger numbers of frigates dedicated to the taskand the lack of any detectors on the uboats that made even the old radars work again all arrived within two months."

"And that was that."

"The Germans finally figured it out some time around November. November!"

"Apparently the pilot made the whole thing up on his own."

"This little white lie helped open the Atlantic to the convoys of 1943 that led to the end of Italy’s involvement and ultimately dday."- maurymarkowitz

Elizabeth Taylor Had Us All Fooled

"That diamonds are valuable."

"Made one family really really rich though lol."

"Gotta love how many people try to defend their artificially inflated value."

"Just shows how well the lie continues to work lol."- sfPanzer

All Talk, NO Truth

"Frank Abagnale Jr., the inspiration for 'Catch me If You Can', apparently wasn’t as big of a con man that the movie leads you to believe."

'He conned people into thinking he was a bigger con man than he actually was."- rickejohn

Surveillance, Or Just Profiling?

"'We are using mass surveillance to help catch terrorists'."- Salty_Cantaloupe4926

All It Takes Is One Click

"'I acknowledge that I have read and agree to the above Terms and Conditions'."- SuvenPan

Maybe Not A Lie, But Pretty Misleading

"Iceland and Greenland."- Technical_Put_9173

...Might Have To Think About This One...

"I before E except after C."

"Unless your foreign neighbor Keith offers you eight counterfeit sleighs from feisty caffeinated weightlifters."

" Weird."- BigJDizzleMaNizzles

It's Easy To Believe Most Rumors...

"In the 90s kids spread the rumor that Marilyn Manson had a rib removed so he could suck his own d*ck."

"We spread this rumor across the entire country without the use of cell phones or the internet."- Solid_Science4514

They Really Weren't The Least Bit Suspicious?

"Trojan horse comes to mind."- riphitter

All ISN'T Fair In Politics...

"That lobbying isn't just bribery with extra steps."- fentown

There's No Way Of Knowing

"One that we'll never know was a lie."- Rare_Cause_1735

Oldest One In The Book...

"It's not you, its me"- read110

It's All In The Balance...

"That fat is harmful to your diet."

"That was just false information."

"And by trying to replace fats with sugar, obesity became an epidemic."- Mangobonbon

Some lies are easily spotted from miles away.

Others are so convincing, the world will never know they were duped.