Stephen Downes

This is a clever tool that helps the reader explore deeper and deeper into a topic. Pick something to explore and it surfaces a bunch of related resources: "surprising associations, facts, links and short videos around anything." You can read the resources or pick one of the new associated concepts to dig even deeper (click on the title, then the 'dig deeper button' - the interface isn't intuitive). I guess my only criticism is that you tend to get more and more general as you dig; my search on B200, for example, led to 'neural network' and 'matrix multiplication' (it's like the old saw where when you followed the links in Wikipedia, you always ended up at Philosophy). Via Nele Hirsch.