62 Never-Before-Seen Nuclear Test Videos Have Been Uploaded to YouTube

Keystone, Getty Images
Keystone, Getty Images

Nuclear testing is rare today, but at its peak it wasn’t unusual for 100 bombs to be detonated in a single year. Many of those explosions were captured on tape, and today the Lawrence Livermore National Laboratory is working to restore the rare footage and share it with the public. As Paleofuture reports, 62 newly declassified test films have just been released as part of the project.

The clips, once considered sensitive government material, are now available on YouTube for anyone to see. They date from the 1940s to the early 1960s and depict atmospheric explosions, a practice that ended in 1962. The U.S. signed a nuclear test ban treaty with the Soviet Union in 1963.

Many of the tapes have been rotting away in government storage facilities after years of neglect. Some films have degraded beyond repair, but most of the dirty, aged material can be salvaged.

"Back in the 1950s they were analyzing frame by frame manually, so the frames were marked with tape so they could keep track," Jim Moye, a rare film expert at the lab, tells Mental Floss. "The tape has to be removed and the adhesive cleaned off. The film is then run through an ultrasonic film cleaner. Then it’s ready for scanning." By cleaning and creating exact copies of the old film, the team is able to preserve that chapter in history for future generations.

Weapon physicist Greg Spriggs is leading the laboratory’s effort to preserve the tapes. The restored films are meant to be seen by the general public, but there’s another audience Spriggs and his team have in mind: other scientists. Today, any nuclear tests conducted by the government are generated by computers. By studying footage from actual explosions, scientists are able to program more accurate models. "Because the United States no longer tests nuclear weapons, it is absolutely essential that we preserve (and improve) these data so that we can continue to study nuclear weapons and their effects," Spriggs tells Mental Floss.

The lab released an initial batch of videos earlier this year, prior to the recent collection shared in December. With thousands of films still left to analyze and restore, viewers can expect a lot more nuclear test content in the coming years.

[h/t Paleofuture]

How Polygraphs Work—And Why They Aren't Admissible in Most Courts

iStock/Sproetniek
iStock/Sproetniek

The truth about lie detectors is that we all really want them to work. It would be much easier if, when police were faced with two contradictory versions of a single event, there was a machine that could identify which party was telling the truth. That’s what the innovators behind the modern-day polygraph set out to do—but the scientific community has its doubts about the polygraph, and all over the world, it remains controversial. Even its inventor was worried about calling it a "lie detector."

AN OFF-DUTY INVENTION

In 1921, John Larson was working as a part-time cop in Berkeley, California. A budding criminologist with a Ph.D. in physiology, Larson wanted to make police investigations more scientific and less reliant on gut instinct and information obtained from "third degree" interrogations.

Building on the work of William Moulton Marston, Larson believed that the act of deception was accompanied by physical tells. Lying, he thought, makes people nervous, and this could be identified by changes in breathing and blood pressure. Measuring these changes in real-time might serve as a reliable proxy for spotting lies.

Improving upon previously developed technologies, Larson created a device that simultaneously recorded changes in breathing patterns, blood pressure, and pulse. The device was further refined by his younger colleague, Leonarde Keeler, who made it faster, more reliable, and portable and added a perspiration test.

Within a few months, a local newspaper ​convinced Larson to publicly test his invention on a man suspected of killing a priest. Larson's machine, which he called a cardio-pneumo psychogram, indicated the suspect’s guilt; the press dubbed the invention a lie detector.

Despite the plaudits, Larson would become skeptical about his machine’s ability to reliably detect deception—especially in regards to Keeler’s methods which amounted to “a psychological third-degree." He was concerned that the polygraph had never matured into anything beyond a glorified stress-detector, and believed that American society had put too much faith in his device. Toward the end of his life, he would refer to it as “a Frankenstein’s monster, which I have spent over 40 years in combating.”

But Keeler, who patented the machine, was much more committed to the lie-detection project, and was eager to see the machine implemented widely to fight crime. In 1935, results of Keeler’s polygraph test were admitted for the first time as evidence in a jury trial—and secured a conviction.

HOW IT WORKS

In its current form, the polygraph test measures changes in respiration, perspiration, and heart rate. Sensors are strapped to the subject's fingers, arm, and chest to report on real-time reactions during interrogation. A spike on these parameters indicates nervousness, and potentially points to lying.

To try to eliminate false-positives, the test ​relies on "control questions."

In a murder investigation, for instance, a suspect may be asked relevant questions such as, "Did you know the victim?" or "Did you see her on the night of the murder?" But the suspect will also be asked broad, stress-inducing control questions about general wrongdoing: "Did you ever take something that doesn't belong to you?" or "Did you ever lie to a friend?" The purpose of the control questions is to be vague enough to make every innocent subject anxious (who hasn't ever lied to a friend?). Meanwhile, a guilty subject is likely to be more worried about answering the relevant questions.

This difference is what the polygraph test is about. According to the American Psychological Association, “A pattern of greater physiological response to relevant questions than to control questions leads to a diagnosis of ‘deception.’” They proclaim that, "Most psychologists agree that there is little evidence that polygraph tests can accurately detect lies."

But a diagnosis of deception doesn’t necessarily mean that someone has actually lied. A polygraph test doesn’t actually detect deception directly; it only shows stress, which was why Larson fought so hard against it being categorized as a "lie detector." Testers have a variety of ways to infer deception (like by using control questions), but, according to the American Psychological Association, the inference process is “structured, but unstandardized” and should not be referred to as “lie detection.”

And so, the validity of the results remains a subject of debate. Depending on whom you ask, the reliability of the test ranges from near-certainty to a coin toss. The American Polygraph Association claims the test has an almost 90 percent accuracy rate. But many psychologists—and even some ​police officers—contend that the test is ​biased toward finding liars and has a 50 percent chance of hitting a false-positive for honest people.

NOT QUITE THE SAME AS FINGERPRINTS

Most countries have traditionally been skeptical about the polygraph test and only a handful have incorporated it into their legal system. The test remains most popular in the United States, where many police departments rely on it to extract confessions from suspects. (In 1978, former CIA director Richard Helms argued that that's because "Americans are not very good at" lying.)

Over the years, the U.S. Supreme Court has issued numerous rulings on the question of whether polygraph tests should be admitted as evidence in criminal trials. Before Larson’s invention, courts treated lie-detection tests with suspicion. In a 1922 case, a judge prohibited the results of a pre-polygraph lie detector from being presented at trial, worrying that the test, despite its unreliability, could have an unwarranted sway on a jury’s opinion.

Then, after his polygraph results secured a conviction in a 1935 murder trial (through prior agreement between the defense and prosecution), Keeler—Larson’s protégé—asserted that “the findings of the lie detector are as acceptable in court as fingerprint testimony.”

But numerous court rulings have ensured that this won’t be the case. Though the technology of the polygraph has continued to improve and the questioning process has become more systematic and standardized, scientists and legal experts remained divided on the device's efficacy.

A 1998 Supreme Court ruling ​concluded that as long as that’s the case, the risk of false positives is too high. The polygraph test, the court concluded, enjoys a scientific “aura of infallibility,” despite the fact “there is simply no consensus that polygraph evidence is reliable,” and ruled that passing the test cannot be seen as proof of innocence. Accordingly, taking the test must remain voluntary, and its results must never be presented as conclusive.

Most importantly: The court left it up to the states to decide whether the test can be presented in court at all. Today, 23 states allow polygraph tests to be admitted as evidence in a trial, and many of those states require the agreement of both parties.

Critics of the polygraph test claim that even in states where the test can't be used as evidence, law enforcers often use it as a tool to ​bully suspects into giving confessions that then can be admitted.

“It does tend to make people frightened, and it does make people confess, even though it cannot detect a lie,” Geoff Bunn, a psychology professor at Manchester Metropolitan University, told The Daily Beast.

But despite criticism—and despite an entire ​industry of former investigators offering to teach individuals how to beat the test—the polygraph is still used ​widely in the United States, mostly in the process of job applications and security checks.

26 of Noah Webster’s Spelling Changes That Didn’t Catch On

Noah Webster had a lasting impact on language in the United States. Before publishing his American Dictionary of the English Language, he produced a series of spelling books (including the one pictured above) that dominated American classrooms for almost a century. He was a proponent of spelling reform, believing that more regular orthography would not only make learning easier, but more importantly, it would distinguish the American way from the British, “an object of vast political consequence” to a young nation. Some of his suggested reforms caught on and still mark a difference between American and British writing: he replaced “colour” with “color,” “centre” with “center,” “defence” with “defense,” “plough” with “plow,” “draught” with “draft,” and “gaol” with “jail.”

However, many of Webster’s reforms went nowhere. Here are 26 spellings that didn’t catch on—at least until the dawn of LOLcats.

1. Cloke — cloak

2. Soop — soup

3. Masheen — machine

4. Tung — tongue 

5. Greef — grief

6. Dawter — daughter

7. Korus — chorus

8. Nightmar — nightmare

9. Turnep — turnip

10. Iland — island

11. Porpess — porpoise

12. Steddy — steady

13. Hainous — heinous

14. Thum — thumb

15. Gillotin — guillotine

16. Spunge — sponge

17. Ake — ache

18. Wimmin — women

19. Determin — determine

20. Giv — give

21. Bilt — built

22. Beleev — believe

23. Grotesk — grotesque

24. Stile — style 

25. Neer — near

26. Sley — sleigh

Inspired by this post from Reddit's Today I Learned.

This article originally ran in 2013.

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