I'm an unabashed admirer of CBC Radio's Ideas, and I was thrilled when they started to podcast some of the programs.

Over the past few weeks I've enjoyed two in particular: this week's "Living on Oxford Time," interviews with three Oxford scientists - Roger Penrose, David Deutsch, and Julian Barbour about the meaning of time, and a haunting two-parter by Philip Coulter about the 1838 expulsion of the Cherokee of the American southeast eight hundred miles to the west, to "Indian Territory," an exodus remembered--if at all--as "The Trail of Tears."