CBC Discover & Learn

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Samfund og kultur

Samfund og kultur

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Historie

08.10.2025
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15. MAJ

How dandelion seeds take flight, and more…

In a study inspired by a field of dandelions, researchers wanted to know why, when you blow on a dandelion seed head, only the seeds closest to you take flight. They found that a dimple in the seed heads where the seed attaches is larger on one side than the other, and that the seeds consistently broke off from the smaller side of that dimple. Once they take flight, each dandelion seed uses its unique shape to catch a ride on the wind. PLUS: Infrasound, not ghosts, may be why old buildings give us the heebie-jeebiesThese arms are made for lovin'. How male octopuses find their matesFrom the archives: Donald Johanson on the discovery of 'Lucy,' our missing linkVirtual hearts help doctors fix patients’ life-threatening irregular heart beatsQuirks Question: What’s the benefit for trees being evergreen?

15. maj

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54 min.
27.05.2025

How the fear of fire is taking control of us

Humans used fire as a tool. Now we fear its destruction. But we're responsible for changing the climate, argues John Vailliant, "in a way that favours fire way more than it favours us." The Vancouver author unpacks how fire made humans who we are — and how humans are changing fire in his award-winning book, Fire Weather: The Making of a Beast.*This episode originally aired on May 29, 2024.

27.05.2025

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54 min.
23.05.2025

Bringing child sex abusers out of the shadows

No one likes talking about child sex abuse. But prevention experts say we need to bring pedophilia out of the shadows if we ever want to end abuse. They insist, it is not inevitable. CBC producer John Chipman explores an innovative new program in Kitchener, Ontario, that has sex offenders and abuse survivors working together to prevent future harm and promote healing. *This episode originally aired on Sept. 23, 2024.

23.05.2025

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55 min.
26.05.2025

The unforgivable crime of being queer in Africa

Homosexuality is a crime in more than half of African countries — a crime punishable by prison sentences. Or in some cases: death. New laws in some states make it illegal for anyone to even advocate for LGBTQ rights. These laws bring up questions of foreign influence, neo-colonialism, and the role the international community could and should play in nudging human rights on the continent.

26.05.2025

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55 min.
4 DAGE SIDEN

Why laughter is so contagious

If you want to hear what a laughing rat sounds like this podcast is for you. From why the sound of laughter triggers us to join in, to how a laughing yoga class starts, to the difference between AHA and HAHA in science, IDEAS contributor Peter Brown takes us on a joyride to reveal the mystery of laugher. Will this podcast make you laugh? Most likely. But it's better than catching a cold. *This episode originally aired on Nov. 4, 2020.

4 dage siden

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54 min.
3 DAGE SIDEN

What North Korea’s personality cult has to do with Jesus

North Korea is no place for evangelical Christians today. But when journalist Jonathan Cheng peeled back decades he found out Christianity is at the heart of the Kim family’s rise to power and continuing dynasty. Cheng has spent 15 years and two trips to North Korea to piece this all together. His book is called Korean Messiah. Jonathan Cheng is the China bureau chief for The Wall Street Journal, and was previously the Korea bureau chief, running coverage of the Korean peninsula, including politics and society in both North and South Korea.

3 dage siden

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54 min.
8. MAJ

A CN Tower-sized mega tsunami, and more…

On the morning of August 10, 2025, a landslide in a fjord along the southern Alaskan coast triggered a mega tsunami. It generated the second highest wave ever recorded that reached up to 481 metres above sea level. A new study suggests that catastrophic events like this are more likely to occur as our climate warms and glaciers melt. PLUS: The hantavirus at the centre of the outbreak struck Argentina in 2018. What did we learn?Raccoons enjoy solving puzzles, just for the fun of itWhat animal parents and distant humans can teach us about caregivingFrom the archives: face to face with the man who killed PlutoQuirks Question: why do my car windows make a ‘wha wha wha’ sound?

8. maj

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54 min.
12. MAJ

How Canada forgot it once had a segregated health system

In the days before her medically-assisted death, journalist Elaine Dewar made it her mission to finish writing her book revealing ignored history. For more than three years, the author investigated how Canada's health care system cruelly mistreated Indigenous people — including forcing them to use segregated hospitals. Dewar's extensive research uncovers not only a shameful past, but that our collective obliviousness to it all was deliberately manufactured.

12. maj

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54 min.
21. APR.

Will AI save us or damn us?

There are no two letters more disruptive in our time than AI. We’re told it will create employment yet take jobs away; invent life-saving medicines yet enable superviruses; solve the climate crisis yet deepen it. So will it save us or damn us? Is AI the ultimate disruptor? This conversation, moderated by Nahlah Ayed, was part of the 2026 Charles Bronfman’s “Conversations” series. Guests in this episode: Yoshua Bengio is a professor at Université de Montreal. He also has the distinction of being the most-cited living scientist in the world, in any discipline. He’s co-president and scientific director of LawZero, a nonprofit startup dedicated to creating safe AI systems. In 2018, he was a recipient of the Turing Award, often referred to as the Nobel Prize of Computer Science. Cory Doctorow is a novelist, journalist, technology activist and the author of an astonishing number of books, both nonfiction and fiction. Among them: Enshittification: Why Everything Suddenly Got Worse and What To Do About It. And the upcoming: The Reverse Centaur’s Guide to Life After AI. Astra Taylor is a documentary filmmaker, cofounder of the Debt Collective, and a writer. Among her books: Democracy May Not Exist But We’ll Miss It When It’s Gone, and The People’s Platform, which won the American Book Award. Taylor also delivered the 2023 CBC Massey Lectures called The Age of Insecurity: Coming Together as Things Fall Apart.

21. apr.

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54 min.
1. MAJ

Your tomatoes have a backstory and it’s not always pretty

In fact, author and journalist Marcello Di Cintio argues Canadians are complicit. After four years investigating the lives of migrant workers, he found that many temporary foreign workers are trapped working in precarious, exploitative conditions. These jobs are essential to our economy and society, yet invisible. Each migrant worker has a story to tell, says Di Cintio. He joined IDEAS host Nahlah Ayed on a visit through the tomato capital of Canada to hear their stories and talk about what his investigation reveals about Canada. *This episode originally aired on Dec. 11, 2025. Marcello Di Cintio's book is called Precarious: The Lives of Migrant Workers.

1. maj

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54 min.

Expand your knowledge and satisfy your curiosity with podcasts exploring the topics affecting us all — from science, climate, and tech news to history and human nature. Award-winning series that enlighten, entertain and inform.

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