Ted Talks.

Not exactly YouTube’s biggest secret, and not even a YouTube exclusive, but Ted Talks are one of the Internet’s oldest continuing sources of mini-lectures on a wide range of scientific and social topics.

Ideas in a nutshell.

“Kurzgezagt” is German for “in a nutshell,” or so I am told by the producers of this channel. They’ve been around quite a while now, making a decent attempt at providing short explanations of complex scientific and philosophical concepts. It’s not just facts – they have their own editorial points of view on many topics, not all of which I would endorse, but they’re worth watching.

There's always something to watch.