The Cracked podcast. I'm not sure if there are others like it, but I enjoy learning new things and/or learning about how I've always been wrong about certain things (e.g. how bad memories are, why the food industry is evil, how different writers have the same ideas all at once, etc.).
It's also a comedy podcast, so there's a lot of pop culture references and ludicrous comparisons (e.g. Hitler wasn't an imposing mastermind--he was Forrest Gump if Forrest Gump didn't like Jewish people and stumbled into political power).