Three of our favorite segments from the week, in case you missed them.

One perspective on free speech in our politics, from Foundation for Individual Rights and Expression CEO Greg Lukianoff (First) | Environmental activist and journalist Bill McKibben reflects on his life's work (Starts at 25:25) | Listeners on their religious conversions (Starts at 1:03:15)

If you don't subscribe to the Brian Lehrer Show on iTunes, you can do that here.