add SL language panel talk

Author: puredanger

content/about/documentary.adoc

@@ -45,6 +45,7 @@ video::Y24vK_QDLFg[youtube, width=400, height=225, title="Clojure: The Documenta
 * https://stuartsierra.com/2007/11/15/clojure-a-lisp-worth-talking-about/[Sierra's Blog on LispNYC Presentation] — 2007. An early public introduction to Clojure.
 * https://www.youtube.com/watch?v=E4RarTAZ2AY[Are We There Yet? (2009)] - The Clojure state model and a dissection of time in programming.
 * https://www.youtube.com/watch?v=f84n5oFoZBc[Hammock Driven Development (2010)] — On thinking deeply about problems before writing code.
+* https://www.youtube.com/watch?v=zhZMaF8vq5Y[Strange Loop Language Panel (2011)] - A fun panel of language designers including Rich Hickey and Gerald Sussman.
 * https://www.youtube.com/watch?v=-6BsiVyC1kM[The Value of Values (2012)] — The case for immutable values over mutable objects.
 * https://www.youtube.com/watch?v=wASCH_gPnDw[Expert to Expert: Rich Hickey and Brian Beckman - Inside Clojure (2013)] - a long-form interview with Rich about Clojure.
 * https://www.youtube.com/watch?v=2V1FtfBDsLU[Effective Programs - 10 Years of Clojure (2017)] - Rich reflects on the first 10 years of Clojure and the prioritization of Clojure's features for solving real-world problems.