This is hands down my favorite podcast. I can't even remember how I discovered it (although while writing this, I came across a link to BoingBoing. That's probably how I discovered it). The format sets it apart from a lot of other podcast out there. While most other shows average about an hour in length, these clock in at about 4-10 minutes each. There's no dead air, each episode is well thought out to pack in a ton of interesting information. One of my favorite episodes is about Privately Owned Public Open Spaces, information I later used on the 100 Dinosaur Scavenger Hunt.