adding session

content/topic/lessons-in-how-not-to-be-heard.md

@@ -1,7 +1,10 @@
 ---
 title: "Lessons in how (not) to be heard"
 has_experiments: ["adversarial-music.md", "ad-versarials.md"]
-
+sessions:
+  [
+    "unsound-2020-session-2.md",
+  ]
 ---
 # Lessons in how (not) to be heard