100 years after combinators were first presented, Stephen Wolfram shows how the computational paradigm moves closer to the idea of combinators through a series of examples and an eye to the future.
Saša Jurić is fantastic at condensing lots of information in a 1 hour talk without losing the audience, he gave another great talk this year called Parsing from first principles (https://www.youtube.com/watch?v=xNzoerDljjo).