CBC Discover & Learn

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Kanal • 22 program

Samhälle och kultur

Samhälle och kultur

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Samhälle och kultur

Samhälle och kultur

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Geovetenskap

Geovetenskap

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Näringsliv

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Samhälle och kultur

Samhälle och kultur

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Vetenskap

Vetenskap

2024-04-22
Historia

Historia

2025-04-02

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A terrifying T. rex of the sea, and more…

The newly described Tylosaurus rex was a violent bus-sized Komodo dragon-like creature with serrated teeth. Dubbed the ‘T. rex of the sea,’ it would have occupied the top of the food chain in the marine ecosystem over 80 million years ago. PLUS: Pigeons use their livers to find their way homeFrom the archives: How Jocelyn Bell Burnell discovered pulsars Scientists discover an underground network of lakes hidden under Arctic ice New book explores the million year history of how we sleep — and why we’re doing it wrong today

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54 min
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The most important numbers in the universe

Numbers get their due credit in this podcast. Even if we're not aware of them, numbers are essential to how we experience the world. IDEAS explores the most bizarre, surprising, mind-blowing and fundamental numbers in the universe. This panel discussion was recorded live at The Perimeter Institute for Theoretical Physics in Waterloo, Ontario. Guests in this episode: Asimina Arvanitaki is a particle physicist and the Aristarchus Chair in Theoretical Physics at the Perimeter Institute. Ben Webster is an associate professor in the Pure Mathematics Department at the University of Waterloo, and he’s an associate faculty member at the Perimeter Institute. Matthew Johnson is an assistant professor of physics and astronomy at York University.

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54 min
22 maj

Listening in on fish grunts, and more…

Scientists recorded audio and video of 8 different kinds of rockfish living in the wild near British Columbia, and were surprised they could tell the species apart through their various grunts, pops and knocks, even though the fish are closely related. PLUS: DNA identifies four Franklin Expedition sailors — and solves a 160-year-old mysteryImmune cells that fight infection get a boost from food Radio waves let us see the unseeable: black holes, pulsars and volcanoes on VenusFrom the archives: What will the Earth look like in 2050?Quirks Question: If chicken and fish blood is red, why are they white meats?

22 maj

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54 min
−3 d

Can we have new pipelines and curb climate change, too?

For the past decade, Canadians have been split 50/50 on new pipelines — that's changed. Two recent opinion polls found roughly three quarters of eligible voters in Canada want at least one new pipeline built to export more fossil fuels. Yet, 70 per cent of people consider climate change a serious threat. IDEAS producer Tom Howell explores the incompatibilities and future scenarios. *This episode originally aired on Oct. 7, 2025. If you liked this episode, you may want to listen to this podcast: A machine that could save us from war — and global warming

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54 min
−1 d

Why Canadians are clinging to their jobs (even when they hate them)

Switching jobs is always a risk, but with high unemployment and iffy economic vibes, right now it feels even riskier. That's why more Canadians are hanging onto their jobs, which is not so great for them — or the economy. Plus, we explore why tinned fish is reeling in a sea of protein-hungry consumers. And, this year’s World Cup is expected to be the biggest money-making event in sports history. So, who gets a piece of that pie?

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27 min
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
20 maj

Why yellow traffic lights were designed to be ambiguous

The yellow traffic light is a perfect example of imperfection — with intention. While driving you have to think fast. Do you speed up or stop, whether that means easily or slamming on the brakes? Every driver has their answer and what lies in the middle is a vast perceptual field. A great deal of thought has gone into the engineering of the ambiguous yellow light, as IDEAS producer Seán Foley found out. He had his own encounter with what he was sure was the shortest yellow light in the world. It resulted in a traffic fine, and gave voice to so many questions. Guests featured in this podcast episode: Travis Stocking is a senior traffic analyst for Durham Region, Ontario Alfred Mele is a philosophy professor at Florida State University Ron Usher is a retired lawyer and IDEAS listener in Parksville, B.C.

20 maj

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54 min
23 maj

"Superfake" counterfeits are flooding into Canada. Here's why.

High quality "superfakes" are on the rise, and luxury shoppers are lovin' it. They cost a fraction of the real thing, but who loses when everyone's buying knock-offs? Plus, shrinkflation is everywhere. So what’s being done in Canada to stop it? And, we explore how the Google search bar is changing and why it matters.

23 maj

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28 min
19 maj

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.

19 maj

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54 min
−6 d

What does it mean for a river to be ‘alive’?

Renowned natural history writer Robert Macfarlane traveled to Ecuador, India and Quebec, pondering the question of whether rivers are living beings — the premise behind much of the movement to legally recognize the rights of nature. He found that the answer to that question is more complicated and wondrous — and more life-altering and world-changing — than he could have imagined. *This episode originally aired on Sept. 3, 2025.

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58 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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