diff --git a/872.myco b/872.myco
deleted file mode 100644
index aa2ba22..0000000
--- a/872.myco
+++ /dev/null
@@ -1,4 +0,0 @@
-= 872
-https://pketh.org/kinopio-qa.html
-
-An interview with Kinopio's creator.
\ No newline at end of file
diff --git a/936.myco b/936.myco
new file mode 100644
index 0000000..b0a85d7
--- /dev/null
+++ b/936.myco
@@ -0,0 +1,9 @@
+= 936
+https://tratt.net/laurie/blog/2023/four_kinds_of_optimisation.html
+
+> *. Use a better algorithm.
+> *. Use a better data-structure.
+> *. Use a lower-level system.
+> *. Accept a less precise solution.
+
+Pick the simplest solution.
\ No newline at end of file
diff --git a/Laurence Tratt: Four Kinds of Optimisation.myco b/Laurence Tratt: Four Kinds of Optimisation.myco
new file mode 100644
index 0000000..6ca05e8
--- /dev/null
+++ b/Laurence Tratt: Four Kinds of Optimisation.myco	
@@ -0,0 +1,9 @@
+= Laurence Tratt: Four Kinds of Optimisation
+https://tratt.net/laurie/blog/2023/four_kinds_of_optimisation.html
+
+> *. Use a better algorithm.
+> *. Use a better data-structure.
+> *. Use a lower-level system.
+> *. Accept a less precise solution.
+
+Pick the simplest solution.
\ No newline at end of file
diff --git a/Productivity vs Insight, Tools for Reflection, and Other Questions Answered.myco b/Productivity vs Insight, Tools for Reflection, and Other Questions Answered.myco
deleted file mode 100644
index fb1f43a..0000000
--- a/Productivity vs Insight, Tools for Reflection, and Other Questions Answered.myco	
+++ /dev/null
@@ -1,4 +0,0 @@
-= Productivity vs Insight, Tools for Reflection, and Other Questions Answered
-https://pketh.org/kinopio-qa.html
-
-An interview with Kinopio's creator.
\ No newline at end of file