Philippa Kaur

Amit Katwala’s thorough history of the lie detector test looks at its inventors and some of its earliest cases, placing it, warts and all, in its historical and scientific context

Humans

13 April 2022

By Chris Stokel-Walker
The polygraph test looked scientific because it was based on physiological readingsPeter Dazeley/Getty Images
Tremors in the Blood
Amit Katwala
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THE polygraph test has been used in criminal prosecutions for decades – a silver bullet for police and prosecutors alike. Measuring heart rate, breathing speed and the conductivity of skin, it is supposedly infallible and given the respectable veneer of science in a courtroom. Someone who flunks the test must be lying, their body’s tell-tale signs betraying their deepest secrets.
Yet that is far from reality. “There is no single tell-tale sign of deception that holds true for everyone – no Pinocchio’s nose,” writes Amit Katwala in Tremors in the Blood. A misfiring test has real ramifications: the US-based National Registry of Exonerations holds records of more than 200 people who failed a polygraph test, were convicted of a crime and imprisoned, but were later found to be innocent.
Katwala’s book traces the test’s history, looking at the early adopters of the technology and some of its earliest cases. The book goes back a century, telling the story of John Larson and Leonarde Keeler, co-inventors of the polygraph (called the emotograph by Keeler), and August Vollmer – all three key to its adoption by US police forces and later worldwide.
Larson was a complex character, breathed back to life by Katwala’s meticulous research. A bookish, morally driven individual, Larson joined the Californian police force in the early 1920s. Unlike the high school dropouts and extortionists who filled the force’s ranks then, Larson was the only police officer in the US with a PhD, in physiology. He would work in university labs by day and police the streets at night.
Larson’s master’s thesis had been on the relatively new technology of fingerprint identification, which had recently become admissible in court. He thought there were still more ways of catching criminals. He was lucky to work under a police chief, Vollmer, who was more bookish than he liked to let on.
Vollmer was equally driven to do the right thing, and was constantly trying to improve policing. In 1921, after reading an academic paper by a psychologist and lawyer who had tested whether his friends were lying based on their blood pressure readings, Vollmer asked Larson to develop a machine that could do the same. The result was mocked by fellow officers, and described in newspapers as looking like a combination of radio, gas stove, stethoscope, dentist’s drill, barometer, wind gauge, time ball (an old form of clock) and watch – but it appeared to work.
Katwala vividly portrays those heady early days when the polygraph seemed to catch out liars. Then, he deftly delivers the twist in the tale: 40-odd years after cobbling together the first machine, Larson forswore his invention because of the way it was used. It was “nothing more than a psychological third degree aimed at extorting confessions, as the old physical beatings were”, he said in an interview – far removed from his meticulous scientific approach.
The book captures the wonder of scientific breakthrough – and what happens as the story becomes more complex. In 1965, the year Larson died, the US House Committee on Government Operations warned that the world had been hoodwinked by “a myth that a metal box in the hands of an investigator can detect truth or falsehood”.
Yet the polygraph is still being used. In 2021, the UK began polygraph testing people convicted of terrorism offences and, later that year, convicted domestic abusers, despite the fact there are serious doubts about whether it works.
Why has the polygraph remained on its pedestal? Perhaps because no one, until now, has placed it, warts and all, in its historical and scientific context.

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CT scans of humans, chimpanzees and macaques reveal that human collarbones slow their growth rate in the final months of pregnancy, perhaps to make it easier for babies to squeeze through the pelvis

Humans

11 April 2022

By Christa Lesté-Lasserre
Collarbones may grow more slowly in the run-up to birthMartins Rudzitis/Getty Images
The collarbones of a human fetus grow more slowly just before birth, with growth then speeding up again during early childhood – probably an evolutionary compromise that allows humans’ relatively wide shoulders to fit through the pelvis.
Broad shoulders may help us with our balance and our ability to throw, and might even help us breathe more effectively. But a fetus with broad shoulders poses a problem during childbirth, because our upright posture has led humans to develop a relatively narrow pelvis.
The newly discovered slow-down-then-catch-up-later growth pattern in human clavicles – collarbones – around the time of birth appears to resolve this “shoulder mystery”, says Naoki Morimoto at Kyoto University in Japan.Advertisement
“There are two things that make human childbirth difficult: a big head and wide shoulders,” he says. “Since [difficult birth] is dangerous… it is sensible to think that humans evolved some ways to ease the problem.”
Previous studies have shown that the heads of human fetuses grow at fast rates in the uterus and then slow down just before birth, he says, which is a trend seen in other primates too – although human heads start to slow down their growth very late compared with other primates.

Curious to know whether the shoulders grow in a similar way, Morimoto and his colleagues examined CT scans of 81 humans (Homo sapiens), 64 chimpanzees (Pan troglodytes) and 31 Japanese macaques (Macaca fuscata). About half of these subjects were fetuses at various stages of development starting from about the beginning of the second trimester. The others were infants and adults.
The team measured the lengths of various bones in the skull, shoulders, upper arm, pelvis, thigh and vertebral column. Generally speaking, the vertebral column’s growth isn’t affected by birth constraints, so it serves as a good basis of comparison for the growth rates of the other bones, says Morimoto.
The researchers confirmed that the growth rate of the skull in all three species reduced just before birth, says Morimoto. Other bones, such as the arms and pelvis, had steady growth in the uterus, but then picked up speed after birth.
As for the collarbones, chimpanzees showed a fairly steady growth rate from before to after birth, he says. The macaques’ collarbones grew steadily before birth and then more slowly after birth.
The human collarbones, however, showed a standout growth pattern, he says. They slowed down about two months before birth and then sped up again over the next five years – creating what the researchers call a “growth depression” that lines up perfectly with when the shoulders need to fit through the pelvis.
“Currently, we simply do not know why this specific pattern in the shoulder – and not other ways like [a slower, steadier growth] – was selected in humans as a means to ease the difficult childbirth,” says co-author Mikaze Kawada, also at Kyoto University. “We need to wait for further studies.”
Journal reference: PNAS, DOI: 10.1073/pnas.2114935119
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The Antikythera mechanism, often called the world’s first computer could calculate the timing of cosmic events – and now we may know the date it was calibrated to

Space

7 April 2022

By Leah Crane
A functional model of the Antikythera mechanismA. Voulgaris
We may have figured out the date from which an ancient device often described as the first computer began its calculations. This device, called the Antikythera mechanism, was built sometime between the years 200 BC and 60 BC, and it was used to track time and predict the motions of celestial bodies.
A spiral shape inset in the back of the mechanism depicts a 223-month cycle called a Saros, which is based on the amount of time it takes for the sun, moon and … More

A tsunami 3800 years ago devastated the coastline of Chile and encouraged hunter-gatherers to move inland, where they stayed for the next 1000 years

Humans

6 April 2022

By Michael Marshall
The Atacama desert in ChileShutterstock/tjalex
An earthquake as large as any in recorded history struck the coast of Chile about 3800 years ago, triggering a tsunami that caused devastation along 1000 kilometres of coastline. In the wake of the tsunami, local hunter-gatherers began spending less time near the coast and moved cemeteries further inland, staying there for 1000 years or more, despite not having a system of writing to convey information about the disaster. 
It is a remarkable example of a society transforming itself to handle natural threats, say the researchers who studied the event.
The team, led by Gabriel Easton at the University of Chile in Santiago, spent years in the Atacama desert on the west coast of South America, gathering evidence of an ancient tsunami.Advertisement
At multiple sites, they found a layer of distinctive sediment dumped by a tsunami. Radiocarbon dates from charcoal and shells in archaeological deposits directly overlying the tsunami sediment suggest it happened about 3800 years ago.
It is impressive that the team has found evidence over such a wide area, says Eugenia Gayo, director of Millennium Nucleus Upwell in Concepción, Chile. “It’s robust.”

The coast of Chile lies on a subduction zone, where one of the tectonic plates that make up Earth’s surface is being forced under another. As a result, the region is prone to large earthquakes. However, the written record in this region is quite short, so it is unclear how big the quakes can be and how often the biggest ones occur.
“We propose that this earthquake was similar to the Valdivia earthquake that occurred in 1960 in southern Chile,” says Easton. “This is the largest earthquake ever recorded in history.” The Valdivia quake had a magnitude of about 9.5, and Easton’s team says the tremor 3800 years ago was similar.
In theory, the Valdivia quake could have been a one-off caused by a very rare combination of circumstances, says Easton. But if a similar quake happened within the past 5000 years, that can’t be true. “This is our proposal, that this area in northern Chile is capable to produce earthquakes of this size,” he says.
Other subduction zones may also have been underestimated, says Easton. He points to the 2011 Tōhoku earthquake, which caused devastation in Japan. Many seismologists thought the region could only produce earthquakes of about magnitude 8.3, but the Tōhoku quake was 9.0 or 9.1.

People have lived in the Atacama for more than 12,000 years. Although the desert gets little rainfall, the marine ecosystems along the coast are rich so hunter-gatherer societies have thrived.
However, Easton and his team documented major shifts that occurred around 3800 years ago. Archaeological sites near the coast show less evidence of habitation, suggesting people stopped going there or at least spent less time there.
Furthermore, cemeteries were moved inland and uphill. The local people mummified their relatives’ bodies and placed great value on having their dead ancestors nearby – a practice that continues to this day in communities in the Andes. “The most important thing that the families and the communities had at that time were their parents,” says Easton, and they took great care to protect them.
This new pattern of behaviour lasted a long time, with many sites only being reoccupied between 1500 and 1000 years ago. “This is kind of surprising, because people usually have a short memory for this kind of event,” says Gayo. Even maintaining the behaviour for 1000 years would have meant sustaining it for 40 generations. “That is a lot.”
It isn’t clear how the memory was preserved. Easton says the message may have been passed on orally, and perhaps through pictures on stone.
For Gayo, the lesson is that sometimes it is necessary to make big changes to adapt to natural hazards. That includes modern societies, which are threatened by growing climate extremes and rising seas. “You need to transform radically,” she says.
Journal reference: Science Advances, DOI: 10.1126/sciadv.abm2996
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Chris Faulkes and Lorna Faulkes
Watch
The Naked Mole-rat: Animal Superhero by evolutionary ecologist Chris Faulkes will explain how this rodent altered our view of human health and ageing. This online talk by London’s Linnean Society is on 13 April at 12.30 BST.

Read
The Book of Minds by Philip Ball argues that we must look beyond our own brains and delve into the minds of other creatures if we want to truly understand ourselves and comprehend the possibility of alien or machine intelligence.Advertisement
Amazon Studios
Watch
Outer Range stars Josh Brolin as a rancher in the Wyoming wilderness whose grip on reality is called into question when a mysterious black void opens up in his western pasture. It will stream on Amazon Prime from 15 April.

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Feedback is our weekly column of bizarre stories, implausible advertising claims, confusing instructions and more

Humans

6 April 2022

Josie Ford
Quantum ‘do
Feedback was relieved to read elsewhere in this august rag recently that black holes aren’t bald, featureless entities with an ever-expanding waistline, but have a bubbling frizziness around their outskirts known in some quarters as “quantum hair” (26 March, p 10). We are relieved not just because the middle-aged look has never been fashionable, but also because this promises a resolution to Stephen Hawking’s black hole information paradox, an unsolvable conundrum in fundamental physics that is also getting depressingly middle-aged.
And developing that new, fresh look is as simple as popping a daily pill, as Suzie Shrubb points out. She forwards us – with an eye on the black holes, we hope, not us – details of Quantum Nutrition Labs’ Quantum Hair, Skin, Nails capsules. These promise “Bioavailable Solubilized Keratin for Quantum-State Support for The Skin, Hair and Nails”, something we find merits the capitals, even as we wonder with Suzie whether the quantum state bit expresses some uncertainty about the product’s efficacy. Still, as she reasonably points out, you will only ever know after you have looked in the box.
For timeless style right from big bang to heat death, we can also recommend Zotos’s Quantum Classic Body hair perm, an acid perm that “creates soft, supportive body and supportive waves for a ‘non-permed’ look”. Coming soon to an event horizon near you.Advertisement
Lose friends, stay healthy
Epidemiology news, as Korean Vaccine Society vice president Ma Sang-hyuk announces that if you haven’t had the dreaded lurgy yet, it is because you have no friends. “Adults who have not yet been infected with COVID-19 are those who have interpersonal problems,” he is reported to have written on Facebook – comments that seem to have won him few friends, and so perhaps a degree of protection, as they were subsequently hastily deleted.
Feedback’s experience suggests you hardly need be in contact with anyone to catch the latest variant nasty. Certainly, we have been trying to build up immunity to infection through social isolation for years, and it didn’t work for us.
Not a prayer
Also strangely transient is Eternal Prayer, a website that briefly offered to mint the prayers of the devout as non-fungible tokens for a small consideration of real-world money.
As deities move in mysterious ways, it seems not unreasonable to us to desire non-falsifiable records of contracts entered into, even if, dinosaur that we are, we prefer the tablets of stone thing. But with the site now defunct, our eternal, fruitless search for meaning in the blockchain continues.
A mattress for all seasons
Bringing us back down to earth, Richard Bartlett notes that the care instructions for his John Lewis mattress include the advice “No turning required, rotate with the seasons.” “Perhaps I should not move it at all relative to the bed but simply allow the mattress to orbit the sun?” he asks. We consider this a wise starting point for anyone invested in a good night’s sleep. Or you could try the alternative interpretation of rotating yourself with the seasons, and see where that lands you.
Come shapely bombs
Feedback is a fan of what novelist Anthony Burgess termed the “arresting opening“. A frisson passes through us as we peruse an article from The Washington Post sent in by Mike Shefler of Gibsonia, Pennsylvania, among others. “Near steep vineyards of riesling grapes, in an underground vault at an air force base in western Germany, sits an American nuclear bomb. More than one of them, actually,” we read. “Each bomb is about the length of two refrigerators laid down end to end and as heavy as the average adult male musk ox. The bombs are slender and pointy and a little more than a foot wide.” We join Mike in a waking reverie on the slender pointiness of the adult male musk ox, and feel the mind-expanding power of quality journalism.
Naughty corner
“I know it’s a bad habit”, sighs our man with the laser sight Jeff Hecht, bringing us to our senses again as he forwards us a briefing from the Government Matters website on high-energy laser weapons. We read that the US Department of Defense plans to deploy a 300-kilowatt laser for testing this November and to develop megawatt lasers effective against some ballistic missiles within a few years. The progress is “really exciting”, says retired US Air Force colonel and director of the Mitchell Institute for Aerospace Studies, Mark Gunzinger.
From beyond the jrave
Stephen Wilhite, creator of the GIF, an invention that has done much to remove the need for words in internet communication, has died. We are commemorating him by playing our favourite GIF of UK politician Liz Truss pronouncing the words “pork markets” with relish. No reason, which is the point.
Sadly, there is no chance of reanimation for Wilhite, but his legacy has brought joy to millions, as well as a lovely debate about pronunciation. In lieu of words on accepting the 2013 Webby Award for lifetime achievement, Wilhite played a five-word animated gif: “IT’S PRONOUNCED “JIF” NOT “GIF”. Somehow, however often you repeat that one, it’s not sticking.
Got a story for Feedback?
You can send stories to Feedback by email at feedback@newscientist.com. Please include your home address. This week’s and past Feedbacks can be seen on our website. More

A new micro-genre of science fiction explores how mind control is at the very heart of our networked existence

Humans

6 April 2022

By Sally Adee

In our hyper-networked world, memetic spread has become uncontrolledShutterstock/Mircea Moira
And Then I Woke Up
Malcolm Devlin
Tordotcom (from 12 April)Advertisement

“THE quality wasn’t very good, but it was good enough for a debate,” says Spence, the narrator of Malcolm Devlin’s short but powerful horror novella And Then I Woke Up. He is describing the viral video that kicked off the zombie apocalypse. “Some people said the men were kissing, some insisted one was biting the neck of the other,” Spence recalls. “He was eating him, they said. Eating him!”
Without giving too much away, Spence is recounting these events from the rehabilitation facility where infected people are slowly reintegrated into society. But if you think I just spoiled the plot, think again. This zombie apocalypse is nothing like what you have been taught to expect by previous books and movies. Devlin has written a horror story where the “zombies” are memes.
Memes are, of course, ideas that lend themselves to jumping from one brain to another. Like that trick where someone tells you not to think about an elephant, once the image has made its way into your mind, you can’t stop the chain of events that unfolds. Richard Dawkins coined the term meme for the phenomenon in 1976, back when it was a relatively unproblematic aspect of how units of culture are transmitted through society. But in our hyper-networked world, memetic spread has become uncontrolled and uncontrollable, and there is something a little unsettling about it. From the QAnon conspiracy theory to the cheezburger cat, there is no telling what will show up in your feed or who produced it. Whether you consent or not, it will nestle between the folds of your brain and start to lay its eggs.
This sinister process is well established in neuroscience: where our expectations lead, our perceptions of reality follow. Memes can set those expectations, distorting and warping them with someone else’s narrative. Sometimes, these are harmless, like the dress that seems to be both blue and white or the audio version, yanny/laurel. Other times, they are more sinister, like the kissing men who may or may not be cannibals, or a conspiracy theory that a pizza restaurant had paedophiles in its basement. Memes can even distort what is right in front of your face.
While the events of Devlin’s book are horrifically plausible, in There is No Antimemetics Division by Sam Hughes (also known by the pseudonym qntm), perceptual expectations are managed by some of the creepiest supernatural beings imaginable. As they lurk unseen by almost everyone, they wreak havoc on an unsuspecting public, who make sense of things by inventing narratives to explain the horrors around them. An entity that creeps around collecting fingers, for example, is explained away as an unusually high rate of kitchen and carpentry accidents.
Devlin and Hughes aren’t the first to explore the power that infectious memes wield over our reality. In The City & the City, China Miéville showed readers two overlapping metropolises in which citizens are trained from birth to “unsee” any evidence of the other city and its residents.
Authors are increasingly waking to the hypnotic power of memes, a topic that is becoming more relevant by the year. These three books are a great introduction to this growing micro-genre of science fiction. I recommend all three of them to the skies. You might end up with a mild case of existential horror, but at least, unlike the stories’ protagonists, you will know what to expect.
Sally also recommends…

Sea of Tranquility
Emily St John Mandel
Picador (from 28 April)

From the fine mind that produced Station Eleven and The Glass Hotel comes another treat: a century-spanning, genre-crossing, time-travel book about the nature of reality, set in a near-future of pandemics and parallel worlds.

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Shutterstock/Madlen
IT WAS out in the desert of New Mexico that humanity first tested the atomic bomb, creating an explosion that left an indelible imprint on our planet. In the same area, just a few dozen kilometres south, scientists are now finding imprints of quite a different sort: human footprints from the Stone Age. These tracks don’t have anything like the historical significance of the first nuclear test – and that is precisely why they are so important.
Archaeology often focuses on the big picture: technological shifts, epic migrations, the fall of civilisations. By contrast, the stones and bones we dig up … More