My bookmark are full of wikipedia and other detail article of science, knowledge, history. For a while, french university wasn't aware of the lack of services about it. But recently, the french leading university ENS of Paris reales a bunch of audio podcast about a lot of different subjects such as: cinema, politics, geography, mathematics, history, history of art, music... And it's everything but not boring!!!
I use to go for those from Harvard, Berkley and others, but finally with one in french, for me, that's enough.