diff --git a/2021-07-17.md b/2021-07-17.md
index 0be330eea..ca49ec6ad 100644
--- a/2021-07-17.md
+++ b/2021-07-17.md
@@ -4,4 +4,7 @@
 		- a [[stream]]
 		- a [[campfire]]
 	- about "i don't like [[social media]], but..."
-	- [[web mentions]] [[indieweb]]
\ No newline at end of file
+	- [[web mentions]] [[indieweb]]
+	- [[stpa]]
+		- [[david spivak]] might have studied it or interacted with it while at mit
+		- [[category theory]] for the sciences
\ No newline at end of file