In our monthly challenge,&nbsp;That's&nbsp;Puzzling!, Piya Chattopadhyay competes against one familiar voice and one clever listener in a battle of brain games devised by puzzle master&nbsp;Peter Brown. Playing this week are retired Olympic gold medal-winning swimmer&nbsp;Mark Tewksbury and Winnipeg listener&nbsp;Nancy Voth.

How war is changing Iran, Flower power, China on the world stage, Measuring everything

Smart takes. Surprising finds. Piya Chattopadhyay helps you understand the important stories with people who know them best, and goes deep with newsmakers and game changers.On Sundays, you'll get the context and forces behind the headlines.On Wednesdays, you'll learn more about the people shaping our culture, and discover something new.So whether you want to understand the world, or escape it for a while, we've got you covered.Catch live and on-demand broadcasts at https://link.mgln.ai/iUSF6q.