There is no podcast I would more highly recommend than 99% Invisible. Roman Mars, the producer, seems to always find topics that are absolutely fascinating. Almost always, I find myself looking at things I see every day in a new light as a result of listening to 99% Invisible.
For example, check out this episode, The Sound of Sport. It’s about sound design in live sport. Did you know they use canned audio for live sporting events? For the rowing events in the olympics, when the camera shows the boat, the sound designers play samples of rowing that they recorded before the fact, knowing they’d need it for the event.