Ideas

Five: a simple, easy number with a diabolical side. As we continue our series, The Greatest Numbers of All Time, meet the Janus-faced figure of five and find out how the number has acquired its personality for people in the arts and sciences. *This episode originally aired on Sept. 28, 2023.

From curses to charms to incantations and evocations, speaking thrice gives power — today, and in the ancient past. As our number series continues, we enter the powerful and spiritual realm of three. *This episode originally aired on Sept. 27, 2023.

It's a time of reflection and looking ahead. Host Nahlah Ayed invites IDEAS producers into the studio to share ideas they are working on for 2025. You’ll hear about income inequality, Nietzsche, the power of itch, the intrigue of the yellow traffic light and the fascinating story of Henry Box Brown — an enslaved man from Virginia who mailed himself to freedom.

It's nothing — and it's everywhere. Zero has confounded humanity for thousands of years. On IDEAS, we explore the infinite danger and promise of the void in a series called The Greatest Numbers of All Time. *This episode originally aired on Sept. 26, 2023.

A childhood full of Christmasses in Wales has left IDEAS producer Tom Howell pining for a certain kind of nostalgic poem this winter. So he turns to poets to put into words a strange feeling of homesickness, nostalgia, and yearning. *This episode originally aired on December 17, 2020.

A profile of the legendary jazz drummer and composer Jerry Granelli who passed away in 2021. Over his career, he accompanied many of the greats: Mose Allison, Sly Stone and The Grateful Dead. Most famously, he was a member of the Vince Guaraldi Trio that recorded the iconic album: A Charlie Brown Christmas. *This episode originally aired on December 21, 2021.

Christmas is a minefield of deep philosophical quandaries, like — is it ethically correct to lie to children? Who does a gift really benefit the giver, or receiver? How do we really know Santa exists, or doesn't? Join us on a dramatic journey through the philosophy of Christmas. *This episode originally aired on December 23, 2020.

Modern mystic Thomas Merton helped to bring contemplative spirituality to the fore during the convulsions of the 20th century. He spins us a powerful, prophetic Christmas story that we don’t often hear, but one that is central to our modern self-understanding.

CBC's investigative documentary program, The Fifth Estate, turned 50 this year. To commemorate this golden anniversary, a panel of distinguished journalists take us behind the stories and to the current threats facing their profession. As the media landscape continues to shrink, who will hold the powerful to account?

The Huarochirí Manuscript is one of the few surviving records of Quechua worldviews in the early modern era. It was once used by the Catholic Church to identify and eradicate “idolatries.” But today, for philosophy professor Jorge Sanchez-Perez, the manuscript is a tool for reconstructing and revitalizing Andean metaphysics. *This episode originally aired on Feb. 6, 2023.