diff --git a/pretext/LinearLinked/WhatAreLinkedStructures.ptx b/pretext/LinearLinked/WhatAreLinkedStructures.ptx
index 1322d4f6..aa8308a8 100644
--- a/pretext/LinearLinked/WhatAreLinkedStructures.ptx
+++ b/pretext/LinearLinked/WhatAreLinkedStructures.ptx
@@ -19,9 +19,9 @@
     
     <video xml:id="uUqCsOcDjVQ" youtube="uUqCsOcDjVQ" width="auto"/>
     
-    <video xml:id="OCYZTg3jahU" youtube="OCYZTg3jahU" width="auto"/>
+    <video xml:id="N6dOwBde7-M" youtube="N6dOwBde7-M" width="auto"/>
     
-    <video xml:id="fiveY-dkurZfgk" youtube="5Y-dkurZfgk" width="auto"/>
+    <video xml:id="R9PTBwOzceo" youtube="R9PTBwOzceo" width="auto"/>
             <p>You can hear and see all of these videos simultaneously, but only because your
             computer switches from one task to another so fast that it appears seamless. Just
             like you, your computer gives each task some time to use its resources and cycles