diff --git a/.zk/notebook.db b/.zk/notebook.db
index 9e3335c..0824c38 100644
Binary files a/.zk/notebook.db and b/.zk/notebook.db differ
diff --git a/zk/Delay_line_memory.md b/zk/Delay_line_memory.md
index cacb024..8b73bbf 100644
--- a/zk/Delay_line_memory.md
+++ b/zk/Delay_line_memory.md
@@ -19,4 +19,4 @@ created: Wednesday, September 18, 2024
     where a pulse is 1 and the absence of a pulse is 0.
   - The pulses are converted into sound waves (as with a speaker) and sent
     through a mercury-filled tube.
-  - The length of the tube
+  - The length of the tube is calculated...