There are lots of big problems in the world: climate change, poverty, war. We have done shows about those problems. And we will do more.
But today's show is about really, really small things.
We ask some of the smartest people we know what little thing they would change to improve the world.
Music: Nick Jaina's "These Fair Hands" and Phoenix's "Consolation Prizes." Find us: Twitter/ Facebook/ Spotify/ Tumblr.