Why yellow traffic lights were invented 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.

Tech billionaires are on a mission to make the stories of science fiction a reality: space colonization, human/machine bio organisms, and living forever in a state of unhindered bliss. This version of a far future utopia may come of as a "billionaire boys and their toys" but experts warn such a dismissive attitude is naïve and dangerous. *This episode originally aired on Jan. 22, 2025.

This isn't a wrap or best of 2025 kind of list. This IDEAS podcast is packed full of all kinds of recommendations from our smart, insightful contributors. We asked them to suggest a work of nonfiction that recently made them think — maybe even think differently — about a particular topic. Their answers cover several genres and varied subjects. Some may surprise you.Don't worry about writing any titles or names down, we have that covered on our website. The online list also includes a bonus: added recommendations from IDEAS producers. Enjoy!

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.Marcello Di Cintio's book is called Precarious: The Lives of Migrant Workers.

Growing up with food insecurity, Julian Napoleon yearned to be a farmer. His great-grandparents once farmed on the Saulteau First Nations reserve in northeastern B.C. Over the decades, the farm was replaced by the bush, and the ideas of communal, seasonal living started to fade away. Five years ago, Julian moved to Amisk Farm to bring it back to life. This year the farm has produced food for over 300 Indigenous households, free of cost.IDEAS visits Amisk Farm to learn about rural food security, Indigenous food sovereignty, farming in the north, and what it means to come home and grow a new home in a radically transformed landscape. 

There’s a constant mantra Frank Gehry would always hear from his mentors who have since died – “Don’t you dare ever stop working.” It’s a sentiment he lived by right until his death at 96. In fact his last major cultural building, the Guggenheim Abu Dhabi, will open in 2026. So how does his fierce, creative drive square with his mortality?In an expansive conversation from 2017 with IDEAS producer Mary Lynk, Gehry shares his thoughts about death and his life, from growing up Jewish in Toronto, to his complicated relationship with his father, to his move to L.A. at 18, to how his career flourished. *This is the second episode in a two-part series.Listen to Part One: The architecture that brought Frank Gehry to tears

Rebel architect Frank Gehry believed architecture IS art. He strived to evoke emotion in every design. Last Friday, Gehry died at 96 but he never stopped creating. In 2017, IDEAS producer Mary Lynk had a rare opportunity to spend two days with Gehry at his LA studio. Their wide-ranging conversation covers many aspects of his life and career, including a moment at 40 when the sight of an ancient piece of art from 500 BC led him to weep. "I think if you went and looked at it, you would cry too," he told Lynk.*This conversation is a two-part series that delves into Frank Gehry's infusion of humanity into his designs.Listen to Part Two: Architect Frank Gehry on how to exit life

Sometimes the universe hands us a gift. Over the past year, our podcast listeners spent a total of 526,915 hours listening to our program. That's 21,954.8 days and that translates to 60 years of listening to us. So what better way to mark IDEAS' 60th year then to look back on the highlights and lowlights of the past six decades. To give you a hint on some of the picks, on the bad list: online identity management. Trickle down economics. On the good: Free Trade. Girl Bosses. Apparently open borders is still an open question.Panelists Jamie Liew, a University of Ottawa law professor and novelist; University of Toronto philosopher, Joseph Heath; and the Canadian Shield Institute’s, Vass Bednar, joined IDEAS producer Mary Lynk on stage, in front of a live audience at the Isabel Bader Theatre for this episode — the last in our special series celebrating our 60th anniversary.Listen to more episodes:The time when a guest said, "I love you!"How an IDEAS episode on traffic changed a doctor's practiceCBC Massey Lecturers reveal how the talks changed themHow IDEAS saved a listener from sending a regrettable email

"IDEAS is often a surprise" says Cathy Pike. It's why she's been a longtime listener. To our delight, IDEAS was there for her just at the right time. After listening to an episode about Friedrich Nietzsche and his philosophy about "the art of passing by," Cathy says she decided not to send an email that she realized she would have regretted. "The program gave me pause and I’m grateful for that.”And we're grateful to hear from Cathy and other listeners who share their personal encounters on how IDEAS shows up for them, as we continue our 60th anniversary series. *This is the fourth episode in our special programming. Listen to other episodes in this series:The time when a guest said, "I love you!"The best — and worst — ideas of the last six decades How an IDEAS episode on traffic changed a doctor's practice  CBC Massey Lecturers reveal how the talks changed them 

This podcast features an all-star, and bestselling, lineup of CBC Massey Lecturers from the past decade: Payam Akhavan (2017) and the police officer who pulled over to the side of the road to keep listening; Sally Armstrong (2019) and the women’s rights groups listening to her talks in Afghanistan, Bangladesh and China; Ron Deibert (2020) and his conviction that ‘philosophical’ radio is more crucial than ever; Esi Edugyan (2021), Tomson Highway (2022) feeling astonished when a stranger recognizes his voice after hearing him on the radio; Margaret MacMillan (2015); Tanya Talaga (2018) and her surprise when an older white man in the audience declares Indigenous activists should “go forth and conquer”; Astra Taylor (2023) and how her secret desire is to work at IDEAS; Jennifer Welsh (2016) comforting an audience member who’d served in Afghanistan; and Ian Williams (2024) on how his lectures have more meanings than he realized — so much so, that he’d like a “second date” with IDEAS.*This is the third episode in our special programming marking our 60th anniversary.Listen to other episodes in this series:The time when a guest said, "I love you!"How an IDEAS episode on traffic changed a doctor's practice  How IDEAS saved a listener from sending a regrettable emailThe best — and worst — ideas of the last six decades