66 million years ago, a huge asteroid hit the earth, wiping out most of the dinosaurs that roamed the land. It would still be tens of millions of years before the first humans appeared - but what if those dinosaurs hadn’t died out? Would we ever have evolved?
CrowdScience listener Sunil was struck by this thought as he passed a Jurassic fossil site: if dinosaurs were still around, would I be here now?
We dive back into the past to see how our distant mammal ancestors managed to live alongside huge, fierce dinosaurs; and why the disappearance of those dinosaurs was great news for mammals. They invaded the spaces left behind, biodiversity flourished, and that led – eventually – to humans evolving. It looks like our existence depends on that big dinosaur extinction.
But we explore a big ‘what if?’: if the asteroid hadn’t hit, could our primate ancestors still have found a niche – somewhere, somehow - to evolve into humans? Or would evolution have taken a radically different path: would dinosaurs have developed human levels of intelligence? Is highly intelligent life inevitable, if you give it long enough to develop? We look to modern day birds - descendants of certain small dinosaurs who survived the asteroid strike - to glean some clues.
With artist Memo Kosemen, palaeontologists Elsa Panciroli and Darren Naish, palaeobiologist Anjali Goswami, and Professor of Comparative Cognition Nicola Clayton
Presented by Marnie Chesterton and Anand Jagatia
Produced by Cathy Edwards for the BBC World Service
(Photo: Silhouette of people and Dino. Credit: Getty Images)
Extracts from unpublished papers on the methods used by a Chinese scientist to genetically modify the embryos of two girls reveal a series of potentially dangerous problems with the procedure and ethical shortcomings.
We look at the mechanism behind the formation of our facial features and how this is linked to our evolution, scrutinise the impact of current emissions on global climates and see why lithium, used in batteries and medicines, is now a potentially widespread pollutant.
(Photo: He Jiankui, Chinese scientist and professor at Southern University of Science and Technology in Shenzhen. Credit:Reuters)
Use of CBD — cannabidiol, the non-psychoactive component in cannabis — has exploded in the last few years. But while it's marketed as a solution for stress, anxiety, insomnia, and pain, the Food and Drug Administration can't say it's safe. NPR health correspondent Allison Aubrey helps parse the science behind a new set of government warnings about CBD. Follow host Maddie Sofia on Twitter @maddie_sofia. Email the show at shortwave@npr.org.
A lot has changed since the first cases of AIDS were reported in 1981. Globally, AIDS-related deaths have dropped by more than 55% since 2004, the deadliest year on record. But, the road to effective treatment for HIV, the virus that causes AIDS, was long. Maggie Hoffman-Terry, a physician and researcher who's been on the front lines of the epidemic for decades, explains how treatment has evolved, its early drawbacks, and the issue of access to medications. Follow Maddie on Twitter — she's @maddie_sofia. And email the show at shortwave@npr.org.
Comet 2I/Borisov will reach its closest approach to the sun on December 8, 2019. We talk to planetary astronomer Michele Bannister about where the heck this comet came from, and what it tells us about our galaxy. Follow Maddie on Twitter — she's @maddie_sofia. And email the show at shortwave@npr.org.
Molecular scale investigations have identified the mechanism which confers resistance to antimalarial drugs. Researchers hope work to turn off this mechanism could mean cheaper well known antimalarials can become effective once again.
We look at the threat to weather forecasting from 5G networks, discuss the origins of much of the technology in our mobile phones and ask what food we’ll be eating in the future and how the past can inform this.
Science fiction is full of people settling on distant planets. But even the closest stars would take millennia to reach with current speeds of travel, by the time any passengers reached an extra solar planet, they would be long dead.
So CrowdScience listener Balaji asked us to find out whether humans could hibernate for interstellar travel?
To uncover the science fact behind this idea, Anand Jagatia holds a tiny hibernating dormouse at the Wildwood Trust in Kent, and meets Dr Samuel Tisherman who puts his patients into suspended animation for a couple of hours, to save their lives after traumatic injuries that cause cardiac arrest. We ask if Dr Tisherman’s research could be extended to put healthy individuals to sleep for much longer periods of time?
It’s a question that neuroscientist, Professor Kelly Drew is studying, in Alaska Fairbanks. She uses Ground Squirrels as a model to understand internal thermostats, and how hibernating mammals manage to reduce their core temperatures to -3 degrees Celsius.
Anand speculates wildly with science fiction authors Adrian Tchaikovsky and Temi Oh whose characters in their books ‘Children of Time’ and ‘Do You Dream of Terra Two?’ traverse enormous distances between habitable planets.
But is human stasis something that would actually be useful? John Bradford is the director of SpaceWorks, this company works with NASA to try to investigate human hibernation for space travel. He’s trying to make space-based human hibernation a reality, and it seems that may be closer than you’d think.
Molecular scale investigations have identified the mechanism which confers resistance to antimalarial drugs. Researchers hope work to turn off this mechanism could mean cheaper well known antimalarials can become effective once again.
We look at the threat to weather forecasting from 5G networks, discuss the origins of much of the technology in our mobile phones and ask what food we’ll be eating in the future and how the past can inform this.
Henri Tajfel’s early life – often awful in the living, exciting in the retelling – gave the pioneering social psychologist the fodder for his life’s defining work: understanding the roots of prejudice.
Born one hundred years ago into a Jewish family in the dawn of an independent Poland created from the detritus of three disintegrated empires, he left Poland to study chemistry in France in the late 1930s. When the Germans dismembered Poland, Tajfel joins a Polish unit in the French army, and is ultimately captured by the Germans. He survived the war as a POW, even as the Nazis exterminated most of his family.
“From that moment on,” his biographer Rupert Brown explains to Dave Edmonds in this Social Science Bites podcast, “one of his driving pre-occupations was to understand how could something like the Holocaust ever have happened.”
After the war, Tajfel worked in orphanages in France and Belgium and then in a displaced persons camp in Germany. At this time he met, and eventually married, a German Jewish woman who had emigrated to England before the war. This led him to move to Britain, where he studied and then taught psychology. His research at Oxford, and later and most notably at Bristol, focused on researching the cognitive roots of prejudice, discrimination and nationalism.
“[H]e made,” said Brown, “this really significant discovery that one doesn’t need very much to invoke inter-group discrimination and prejudice. Simply being told that you’re in one group or another seems to be enough to trigger that discrimination.”
Using a technique known as ‘minimal group experiments’ – creating kinship based on as little as what sort of abstract painting you like or what colour you prefer – Tajfel determined that “if you imposed categories on anything you are viewing or are living, people start exaggerating the differences between the two groups. He wondered, ‘Could we observe the same thing in a real behavioural situation?’”
Such questions conflicted with many of the then-prevailing notions of how prejudice arises, which Tajfel saw as too generic and too idiosyncratic. Based on the individual, they didn’t account for the clear historical precedent, Germany in the 1930s, that Tajfel saw firsthand (nor current examples like Islamophobia). Can that come down a particular personality or a particular level of frustration, Brown recounts Tajfel thinking. “He just thought that didn’t wash.”
As others have built on his insights, Tajfel’s own work now sounds much like conventional wisdom, even if Tajfel himself didn’t push into applications and left out issues like emotion and gender in his theorising. “In itself, social identity theory is rather an impoverished explanation for things like genocide, things like inter-group slaughter,” Brown says. “Because what does it say – ‘We want our group to be a little better than the other group,’ ‘we‘re looking for positive distinctiveness’? In trying to understand hatred, intergroup violence, we have to go beyond positive distinctiveness. There must be something else that drives people’s anger and hostility.”
Of late, Tajfel’s behaviour has overshadowed his contributions. He died in 1982, and in the 1960s and 1970s he was a serial sexual harasser of young women in his lab and elsewhere (and a difficult and demanding professor overall, as Brown, one of his former PhD students, confirmed). That legacy was known but ignored for years, and the European Association of Social Psychology instituted an important award for lifetime achievement in Tajfel’s name the year he died. This autumn, however, the Association rethought that decision; “naming an award after a person suggests that this individual is a role model as a scientist and beyond,” the organization stated as it announced renaming the award.
Brown does not shy away from the conduct in this podcast or in his new book, Henri Tajfel: Explorer of Identity and Difference. Nor does he defend it, although he does question the renaming: “The prize wasn’t given to recognise moral probity; it was given for contributions to the discipline.” (Brown’s research and his book were supported by a major research fellowship by The Leverhulme Trust and the European Association of Social Psychology itself.)
Clive Wynne, founding director of the Canine Science Collaboratory at Arizona State University, draws on studies from his lab and others around the world to explain what biology, neuroscience, and genetics reveal about dogs and love. His new book is called Dog Is Love: Why and How Your Dog Loves You. Follow host Maddie Sofia on Twitter @maddie_sofia. Email the show at shortwave@npr.org.
Science fiction is full of people settling on distant planets. But even the closest stars would take millennia to reach with current speeds of travel, by the time any passengers reached an extra solar planet, they would be long dead.
So CrowdScience listener Balaji asked us to find out whether humans could hibernate for interstellar travel?
To uncover the science fact behind this idea, Anand Jagatia holds a tiny hibernating dormouse at the Wildwood Trust in Kent, and meets Dr Samuel Tisherman who puts his patients into suspended animation for a couple of hours, to save their lives after traumatic injuries that cause cardiac arrest. We ask if Dr Tisherman’s research could be extended to put healthy individuals to sleep for much longer periods of time?
It’s a question that neuroscientist, Professor Kelly Drew is studying, in Alaska Fairbanks. She uses Ground Squirrels as a model to understand internal thermostats, and how hibernating mammals manage to reduce their core temperatures to -3 degrees Celsius.
Anand speculates wildly with science fiction authors Adrian Tchaikovsky and Temi Oh whose characters in their books ‘Children of Time’ and ‘Do You Dream of Terra Two?’ traverse enormous distances between habitable planets.
But is human stasis something that would actually be useful? John Bradford is the director of SpaceWorks, this company works with NASA to try to investigate human hibernation for space travel. He’s trying to make space-based human hibernation a reality, and it seems that may be closer than you’d think.
Presented by Anand Jagatia
Produced by Rory Galloway
(Photo: People in hibernation. Credit: Getty Images)
