Host Piya Chattopadhyay speaks with The Economist's Rob Russo, Le Devoir's Emilie Nicolas and Ian Austen from The New York Times about the Liberal leadership race and Donald Trump's growing threats to Canada, we explore the defining moments of the 21st century as it hits the quarter-way mark, The Washington Post's Toluse "Tolu" Olorunnipa and author Chris Whipple look back on Joe Biden's legacy as he exits the White House, Canadian Raymond Francis talks about losing his home in the California wildfires, and our monthly challenge That's Puzzling! returns.

Discover more at cbc.ca/sunday