The Washington Post just borked their RSS feed resulting in subscribers to the series to get duplicate notifications for shows they had already received.
The RSS spec defines something called a GUID (Globally Unique Identifier). We publish things we see new GUIDs for. Podcast publishing systems tend to use file path as GUIDs. This is a horrible idea because if you change your file system structure, all your subscribers download additional copies of old shows.
We're going to rework this and create our own GUIDs from the audio file itself.
Sorry about that to all the WaPo subscribers