https://www.youtube.com/playlist?list=PL__VKmxAeRq8fmie9GwArs5nvP6yi-r4n
https://channel9.msdn.com/posts/Expert-to-Expert-Erik-Meijer-and-Rich-Hickey-Clojure-and-Datomic https://channel9.msdn.com/Shows/Going+Deep/Expert-to-Expert-Rich-Hickey-and-Brian-Beckman-Inside-Clojure