diff --git a/doc/pub/week41/html/week41-bs.html b/doc/pub/week41/html/week41-bs.html
index 3dddc7eed..1bfd1203a 100644
--- a/doc/pub/week41/html/week41-bs.html
+++ b/doc/pub/week41/html/week41-bs.html
@@ -453,9 +453,9 @@ MathJax.Hub.Config({
 <h2 id="material-for-the-lecture-on-monday-october-6-2025" class="anchor">Material for the lecture on Monday October 6, 2025 </h2>
 <ol>
 <li> Neural Networks, setting up the basic steps, from the simple perceptron model to the multi-layer perceptron model.</li>
-<li> Building our own Feed-forward Neural Network, getting started
-<!-- * Video of lecture notes at URL:"" -->
-<!-- * Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_self"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a> --></li>
+<li> Building our own Feed-forward Neural Network, getting started</li>
+<li> Video of lecture notes at <a href="https://youtu.be/96Pe6O9Wn6g" target="_self"><tt>https://youtu.be/96Pe6O9Wn6g</tt></a></li>
+<li> Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_self"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a></li>
 </ol>
 <!-- !split -->
 <h2 id="readings-and-videos" class="anchor">Readings and Videos: </h2>
diff --git a/doc/pub/week41/html/week41-reveal.html b/doc/pub/week41/html/week41-reveal.html
index bab4fc34e..ad3a4b3a8 100644
--- a/doc/pub/week41/html/week41-reveal.html
+++ b/doc/pub/week41/html/week41-reveal.html
@@ -199,9 +199,9 @@ MathJax.Hub.Config({
 <h2 id="material-for-the-lecture-on-monday-october-6-2025">Material for the lecture on Monday October 6, 2025 </h2>
 <ol>
 <p><li> Neural Networks, setting up the basic steps, from the simple perceptron model to the multi-layer perceptron model.</li>
-<p><li> Building our own Feed-forward Neural Network, getting started
-<!-- * Video of lecture notes at URL:"" -->
-<!-- * Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_blank"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a> --></li>
+<p><li> Building our own Feed-forward Neural Network, getting started</li>
+<p><li> Video of lecture notes at <a href="https://youtu.be/96Pe6O9Wn6g" target="_blank"><tt>https://youtu.be/96Pe6O9Wn6g</tt></a></li>
+<p><li> Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_blank"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a></li>
 </ol>
 </section>
 
diff --git a/doc/pub/week41/html/week41-solarized.html b/doc/pub/week41/html/week41-solarized.html
index 205604842..a0b152cea 100644
--- a/doc/pub/week41/html/week41-solarized.html
+++ b/doc/pub/week41/html/week41-solarized.html
@@ -367,9 +367,9 @@ MathJax.Hub.Config({
 <h2 id="material-for-the-lecture-on-monday-october-6-2025">Material for the lecture on Monday October 6, 2025 </h2>
 <ol>
 <li> Neural Networks, setting up the basic steps, from the simple perceptron model to the multi-layer perceptron model.</li>
-<li> Building our own Feed-forward Neural Network, getting started
-<!-- * Video of lecture notes at URL:"" -->
-<!-- * Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_blank"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a> --></li>
+<li> Building our own Feed-forward Neural Network, getting started</li>
+<li> Video of lecture notes at <a href="https://youtu.be/96Pe6O9Wn6g" target="_blank"><tt>https://youtu.be/96Pe6O9Wn6g</tt></a></li>
+<li> Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_blank"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a></li>
 </ol>
 <!-- !split --><br><br><br><br><br><br><br><br><br><br>
 <h2 id="readings-and-videos">Readings and Videos: </h2>
diff --git a/doc/pub/week41/html/week41.html b/doc/pub/week41/html/week41.html
index 8a6d24872..ce4d0b84c 100644
--- a/doc/pub/week41/html/week41.html
+++ b/doc/pub/week41/html/week41.html
@@ -444,9 +444,9 @@ MathJax.Hub.Config({
 <h2 id="material-for-the-lecture-on-monday-october-6-2025">Material for the lecture on Monday October 6, 2025 </h2>
 <ol>
 <li> Neural Networks, setting up the basic steps, from the simple perceptron model to the multi-layer perceptron model.</li>
-<li> Building our own Feed-forward Neural Network, getting started
-<!-- * Video of lecture notes at URL:"" -->
-<!-- * Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_blank"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a> --></li>
+<li> Building our own Feed-forward Neural Network, getting started</li>
+<li> Video of lecture notes at <a href="https://youtu.be/96Pe6O9Wn6g" target="_blank"><tt>https://youtu.be/96Pe6O9Wn6g</tt></a></li>
+<li> Whiteboard notes at <a href="https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf" target="_blank"><tt>https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf</tt></a></li>
 </ol>
 <!-- !split --><br><br><br><br><br><br><br><br><br><br>
 <h2 id="readings-and-videos">Readings and Videos: </h2>
diff --git a/doc/pub/week41/ipynb/ipynb-week41-src.tar.gz b/doc/pub/week41/ipynb/ipynb-week41-src.tar.gz
index f9e5ab5a9..e9076d645 100644
Binary files a/doc/pub/week41/ipynb/ipynb-week41-src.tar.gz and b/doc/pub/week41/ipynb/ipynb-week41-src.tar.gz differ
diff --git a/doc/pub/week41/ipynb/week41.ipynb b/doc/pub/week41/ipynb/week41.ipynb
index 4911c6049..207d358c6 100644
--- a/doc/pub/week41/ipynb/week41.ipynb
+++ b/doc/pub/week41/ipynb/week41.ipynb
@@ -2,7 +2,7 @@
  "cells": [
   {
    "cell_type": "markdown",
-   "id": "b625bb28",
+   "id": "fda119b0",
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@@ -14,7 +14,7 @@
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+   "id": "1038a70c",
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@@ -27,7 +27,7 @@
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-   "id": "d7401ab9",
+   "id": "68c8b82a",
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@@ -37,7 +37,7 @@
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-   "id": "f47e1c5c",
+   "id": "69bd69a9",
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@@ -46,13 +46,15 @@
     "1. Neural Networks, setting up the basic steps, from the simple perceptron model to the multi-layer perceptron model.\n",
     "\n",
     "2. Building our own Feed-forward Neural Network, getting started\n",
-    "<!-- * Video of lecture notes at URL:\"\" -->\n",
-    "<!-- * Whiteboard notes at <https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf> -->"
+    "\n",
+    "3. Video of lecture notes at <https://youtu.be/96Pe6O9Wn6g>\n",
+    "\n",
+    "4. Whiteboard notes at <https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf>"
    ]
   },
   {
    "cell_type": "markdown",
-   "id": "af0a9895",
+   "id": "d1ff08da",
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@@ -77,7 +79,7 @@
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@@ -93,7 +95,7 @@
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@@ -104,7 +106,7 @@
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@@ -117,7 +119,7 @@
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@@ -127,7 +129,7 @@
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@@ -145,7 +147,7 @@
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@@ -169,7 +171,7 @@
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@@ -187,7 +189,7 @@
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@@ -227,7 +229,7 @@
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@@ -256,7 +258,7 @@
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@@ -277,7 +279,7 @@
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@@ -306,7 +308,7 @@
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@@ -327,7 +329,7 @@
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@@ -348,7 +350,7 @@
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@@ -365,7 +367,7 @@
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@@ -386,7 +388,7 @@
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@@ -402,7 +404,7 @@
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@@ -421,7 +423,7 @@
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@@ -445,7 +447,7 @@
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@@ -472,7 +474,7 @@
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@@ -489,7 +491,7 @@
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@@ -501,7 +503,7 @@
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@@ -512,7 +514,7 @@
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@@ -530,7 +532,7 @@
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@@ -559,7 +561,7 @@
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@@ -573,7 +575,7 @@
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@@ -589,7 +591,7 @@
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@@ -601,7 +603,7 @@
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@@ -615,7 +617,7 @@
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@@ -627,7 +629,7 @@
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@@ -643,7 +645,7 @@
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@@ -659,7 +661,7 @@
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@@ -671,7 +673,7 @@
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@@ -681,7 +683,7 @@
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@@ -693,7 +695,7 @@
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@@ -711,7 +713,7 @@
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@@ -724,7 +726,7 @@
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@@ -741,7 +743,7 @@
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@@ -1175,7 +1177,7 @@
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@@ -1208,7 +1207,7 @@
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@@ -1219,7 +1218,7 @@
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@@ -1231,7 +1230,7 @@
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@@ -1241,7 +1240,7 @@
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@@ -1253,7 +1252,7 @@
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@@ -1266,7 +1265,7 @@
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@@ -1278,7 +1277,7 @@
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@@ -1290,7 +1289,7 @@
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@@ -1331,7 +1330,7 @@
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@@ -1363,7 +1362,7 @@
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@@ -1375,7 +1374,7 @@
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@@ -1385,7 +1384,7 @@
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@@ -1475,7 +1474,7 @@
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@@ -1493,7 +1492,7 @@
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@@ -1572,7 +1568,7 @@
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@@ -1813,7 +1809,7 @@
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@@ -1848,7 +1844,7 @@
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@@ -1861,7 +1857,7 @@
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@@ -1871,7 +1867,7 @@
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@@ -1893,7 +1889,7 @@
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@@ -1915,7 +1911,7 @@
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@@ -1931,7 +1927,7 @@
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@@ -1948,7 +1944,7 @@
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@@ -1960,7 +1956,7 @@
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@@ -1973,7 +1969,7 @@
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@@ -1986,7 +1982,7 @@
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@@ -1998,7 +1994,7 @@
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@@ -2008,7 +2004,7 @@
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@@ -2020,7 +2016,7 @@
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@@ -2035,7 +2031,7 @@
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@@ -2050,7 +2046,7 @@
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@@ -2062,7 +2058,7 @@
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@@ -2076,7 +2072,7 @@
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@@ -2088,7 +2084,7 @@
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@@ -2104,7 +2100,7 @@
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@@ -2120,7 +2116,7 @@
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@@ -2132,7 +2128,7 @@
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@@ -2142,7 +2138,7 @@
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@@ -2154,7 +2150,7 @@
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@@ -2164,7 +2160,7 @@
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@@ -2176,7 +2172,7 @@
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@@ -2214,7 +2210,7 @@
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@@ -2226,7 +2222,7 @@
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@@ -2248,7 +2244,7 @@
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@@ -2260,7 +2256,7 @@
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@@ -2270,7 +2266,7 @@
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@@ -2286,7 +2282,7 @@
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@@ -2298,7 +2294,7 @@
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@@ -2310,7 +2306,7 @@
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@@ -2322,7 +2318,7 @@
   },
   {
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-   "id": "b2a0a41b",
+   "id": "b5e192ac",
    "metadata": {
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@@ -2334,7 +2330,7 @@
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   {
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+   "id": "d348a3eb",
    "metadata": {
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@@ -2346,7 +2342,7 @@
   },
   {
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+   "id": "46c1d7be",
    "metadata": {
     "editable": true
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@@ -2356,7 +2352,7 @@
   },
   {
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-   "id": "bb720314",
+   "id": "9e4495b0",
    "metadata": {
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@@ -2372,7 +2368,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "52217a26",
+   "id": "3f89cc68",
    "metadata": {
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@@ -2384,7 +2380,7 @@
   },
   {
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-   "id": "eb647e50",
+   "id": "846a77a6",
    "metadata": {
     "editable": true
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@@ -2396,7 +2392,7 @@
   },
   {
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-   "id": "cda95964",
+   "id": "bb92d674",
    "metadata": {
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@@ -2406,7 +2402,7 @@
   },
   {
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-   "id": "130a2766",
+   "id": "1d3d0643",
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@@ -2418,7 +2414,7 @@
   },
   {
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+   "id": "1c17f3b2",
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@@ -2432,7 +2428,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cde60cd2",
+   "id": "d87898d3",
    "metadata": {
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@@ -2449,73 +2445,13 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 1,
-   "id": "3616dd69",
+   "execution_count": 3,
+   "id": "f6b380d8",
    "metadata": {
     "collapsed": false,
-    "editable": true,
-    "jupyter": {
-     "outputs_hidden": false
-    }
+    "editable": true
    },
-   "outputs": [
-    {
-     "name": "stdout",
-     "output_type": "stream",
-     "text": [
-      "[36.89563074]\n",
-      "[23.62323175]\n",
-      "[15.1251681]\n",
-      "[9.68402334]\n",
-      "[6.20020163]\n",
-      "[3.96963458]\n",
-      "[2.54150298]\n",
-      "[1.62714703]\n",
-      "[1.0417409]\n",
-      "[0.66694492]\n",
-      "[0.42699034]\n",
-      "[0.27336592]\n",
-      "[0.17501258]\n",
-      "[0.11204514]\n",
-      "[0.07173249]\n",
-      "[0.04592382]\n",
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-      "[0.01882264]\n",
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-      "[0.003162]\n",
-      "[0.00202433]\n",
-      "[0.00129599]\n",
-      "[0.0008297]\n",
-      "[0.00053118]\n",
-      "[0.00034006]\n",
-      "[0.00021771]\n",
-      "[0.00013938]\n",
-      "[8.92313548e-05]\n",
-      "[5.71263851e-05]\n",
-      "[3.6572612e-05]\n",
-      "[2.34139775e-05]\n",
-      "[1.49897504e-05]\n",
-      "[9.5965161e-06]\n",
-      "[6.14373934e-06]\n",
-      "[3.93325371e-06]\n",
-      "[2.51808934e-06]\n",
-      "[1.61209378e-06]\n",
-      "[1.03207075e-06]\n",
-      "[6.60737006e-07]\n",
-      "[4.23007231e-07]\n",
-      "[2.70811405e-07]\n",
-      "[1.73374853e-07]\n",
-      "[1.10995472e-07]\n",
-      "[7.10598715e-08]\n",
-      "[4.54928947e-08]\n",
-      "[2.91247848e-08]\n",
-      "[1.86458368e-08]\n",
-      "[1.19371605e-08]\n"
-     ]
-    }
-   ],
+   "outputs": [],
    "source": [
     "import numpy as np\n",
     "# We use the Sigmoid function as activation function\n",
@@ -2583,7 +2519,7 @@
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   {
    "cell_type": "markdown",
-   "id": "3348a149",
+   "id": "a7ed94bd",
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@@ -2593,7 +2529,7 @@
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@@ -2611,7 +2547,7 @@
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@@ -2628,7 +2564,7 @@
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@@ -2640,7 +2576,7 @@
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@@ -2650,7 +2586,7 @@
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@@ -2662,7 +2598,7 @@
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@@ -2678,7 +2614,7 @@
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@@ -2690,7 +2626,7 @@
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@@ -2702,7 +2638,7 @@
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@@ -2713,7 +2649,7 @@
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+   "id": "1708ac04",
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@@ -2725,7 +2661,7 @@
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@@ -2738,7 +2674,7 @@
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+   "id": "c402877d",
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@@ -2750,7 +2686,7 @@
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@@ -2760,7 +2696,7 @@
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+   "id": "5ddb4ea7",
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@@ -2772,7 +2708,7 @@
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@@ -2784,7 +2720,7 @@
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@@ -2796,7 +2732,7 @@
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+   "id": "9a4f7ae1",
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@@ -2806,7 +2742,7 @@
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@@ -2818,7 +2754,7 @@
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@@ -2834,7 +2770,7 @@
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+   "id": "fd68932d",
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@@ -2846,7 +2782,7 @@
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+   "id": "8fe55456",
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@@ -2856,7 +2792,7 @@
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+   "id": "90961a11",
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@@ -2868,7 +2804,7 @@
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   {
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+   "id": "7762b2ae",
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@@ -2878,7 +2814,7 @@
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   {
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+   "id": "dafa94cd",
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@@ -2890,7 +2826,7 @@
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   {
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+   "id": "1ee741d3",
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@@ -2902,7 +2838,7 @@
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   {
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+   "id": "57285440",
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@@ -2915,7 +2851,7 @@
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   {
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+   "id": "4015f8b6",
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@@ -2925,7 +2861,7 @@
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   {
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-   "id": "85a0f70d",
+   "id": "0ae4f875",
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@@ -2937,7 +2873,7 @@
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-   "id": "108db06e",
+   "id": "58474c41",
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@@ -2947,7 +2883,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2922e5c6",
+   "id": "cdce5910",
    "metadata": {
     "editable": true
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@@ -2959,7 +2895,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cb6f6fe5",
+   "id": "9cb2330b",
    "metadata": {
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@@ -2970,7 +2906,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "3a0d272d",
+   "id": "4cf867ce",
    "metadata": {
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@@ -2982,7 +2918,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "70a6cf5c",
+   "id": "058be70c",
    "metadata": {
     "editable": true
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@@ -2992,7 +2928,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a862fb73",
+   "id": "0718aad7",
    "metadata": {
     "editable": true
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@@ -3004,7 +2940,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "703fa2c1",
+   "id": "3eb105cd",
    "metadata": {
     "editable": true
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@@ -3014,7 +2950,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2032458a",
+   "id": "1e87092e",
    "metadata": {
     "editable": true
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@@ -3026,7 +2962,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "97d8acd7",
+   "id": "06a05ad6",
    "metadata": {
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@@ -3038,7 +2974,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "972e5301",
+   "id": "4a6b23b7",
    "metadata": {
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@@ -3050,7 +2986,7 @@
   },
   {
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-   "id": "ba8f5955",
+   "id": "1205a0c6",
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@@ -3060,7 +2996,7 @@
   },
   {
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-   "id": "3ac41463",
+   "id": "6521c77b",
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@@ -3072,7 +3008,7 @@
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   {
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-   "id": "ab92a69c",
+   "id": "387bca3c",
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@@ -3082,7 +3018,7 @@
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   {
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-   "id": "8224b6f2",
+   "id": "10bbe577",
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@@ -3094,7 +3030,7 @@
   },
   {
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-   "id": "b55a566b",
+   "id": "285b1083",
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@@ -3106,7 +3042,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "cb5f687e",
+   "id": "189494bf",
    "metadata": {
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@@ -3118,7 +3054,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "6d8361e8",
+   "id": "6935c64e",
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@@ -3128,7 +3064,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ccfb7fa8",
+   "id": "e5d4fc04",
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@@ -3140,7 +3076,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "20fd0aa3",
+   "id": "81160d9f",
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@@ -3150,7 +3086,7 @@
   },
   {
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-   "id": "6bca7f99",
+   "id": "287770fc",
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@@ -3163,7 +3099,7 @@
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   {
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-   "id": "430e26d8",
+   "id": "fe3ad298",
    "metadata": {
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@@ -3175,7 +3111,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ced71f83",
+   "id": "35db83e2",
    "metadata": {
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@@ -3185,7 +3121,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ec12ee1a",
+   "id": "e81582fe",
    "metadata": {
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@@ -3197,7 +3133,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f46fe24d",
+   "id": "371516fe",
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@@ -3207,7 +3143,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "af8f924d",
+   "id": "2c9d92af",
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@@ -3219,7 +3155,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "4aeb6140",
+   "id": "e3e1c8be",
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@@ -3229,7 +3165,7 @@
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-   "id": "0bc2f26c",
+   "id": "5e1403b0",
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@@ -3241,7 +3177,7 @@
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   {
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-   "id": "7eafd358",
+   "id": "29f57c65",
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@@ -3251,7 +3187,7 @@
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-   "id": "548f58f6",
+   "id": "0d84bfc1",
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@@ -3263,7 +3199,7 @@
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   {
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+   "id": "b2c26b76",
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@@ -3275,7 +3211,7 @@
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+   "id": "e819129e",
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@@ -3285,7 +3221,7 @@
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-   "id": "ed0c0029",
+   "id": "b1a4a0fe",
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@@ -3297,7 +3233,7 @@
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+   "id": "3c1a488d",
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@@ -3310,7 +3246,7 @@
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+   "id": "12f13d1c",
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@@ -3324,7 +3260,7 @@
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+   "id": "dce39d07",
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@@ -3336,7 +3272,7 @@
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   {
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+   "id": "e9e56334",
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@@ -3346,7 +3282,7 @@
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+   "id": "36dedc68",
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@@ -3358,7 +3294,7 @@
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+   "id": "7c1f56c5",
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@@ -3368,7 +3304,7 @@
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+   "id": "8fdbfe02",
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@@ -3380,7 +3316,7 @@
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+   "id": "a6be0f67",
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@@ -3398,7 +3334,7 @@
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+   "id": "774fed1c",
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@@ -3416,7 +3352,7 @@
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+   "id": "a993dc18",
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@@ -3428,7 +3364,7 @@
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+   "id": "669e403a",
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@@ -3438,7 +3374,7 @@
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+   "id": "71efb79b",
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@@ -3450,7 +3386,7 @@
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+   "id": "db91aa56",
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@@ -3462,7 +3398,7 @@
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-   "id": "c7156e16",
+   "id": "863fd39c",
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@@ -3474,7 +3410,7 @@
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-   "id": "8311b4aa",
+   "id": "d7a29955",
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@@ -3484,7 +3420,7 @@
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+   "id": "8a4635df",
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@@ -3496,7 +3432,7 @@
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+   "id": "ea6450ca",
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@@ -3506,7 +3442,7 @@
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+   "id": "56c847db",
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@@ -3518,7 +3454,7 @@
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-   "id": "9f018cff",
+   "id": "6f455069",
    "metadata": {
     "editable": true
    },
@@ -3536,7 +3472,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ebde7551",
+   "id": "0a56ea2a",
    "metadata": {
     "editable": true
    },
@@ -3546,7 +3482,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f96aa8f7",
+   "id": "c4a0f00b",
    "metadata": {
     "editable": true
    },
@@ -3564,7 +3500,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1215d118",
+   "id": "5635a28d",
    "metadata": {
     "editable": true
    },
@@ -3574,7 +3510,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "c5f6885e",
+   "id": "f61fc9dd",
    "metadata": {
     "editable": true
    },
@@ -3592,7 +3528,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1dedde99",
+   "id": "6c0414f4",
    "metadata": {
     "editable": true
    },
@@ -3604,7 +3540,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "a182b912",
+   "id": "2e382020",
    "metadata": {
     "editable": true
    },
@@ -3616,7 +3552,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9fcc3201",
+   "id": "83d468a5",
    "metadata": {
     "editable": true
    },
@@ -3626,7 +3562,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "54237463",
+   "id": "068475e3",
    "metadata": {
     "editable": true
    },
@@ -3638,7 +3574,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "dc069f5a",
+   "id": "a805b943",
    "metadata": {
     "editable": true
    },
@@ -3650,7 +3586,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "71ba0435",
+   "id": "3662ac90",
    "metadata": {
     "editable": true
    },
@@ -3660,7 +3596,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "bd00cbe9",
+   "id": "86ef1273",
    "metadata": {
     "editable": true
    },
@@ -3672,7 +3608,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1e7e0241",
+   "id": "ec2c38d1",
    "metadata": {
     "editable": true
    },
@@ -3682,7 +3618,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "e8e3697e",
+   "id": "bcb000b3",
    "metadata": {
     "editable": true
    },
@@ -3694,7 +3630,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "7d86a02b",
+   "id": "86ac8888",
    "metadata": {
     "editable": true
    },
@@ -3706,7 +3642,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "ff1dc46f",
+   "id": "ebf7592a",
    "metadata": {
     "editable": true
    },
@@ -3729,7 +3665,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "1313e6dc",
+   "id": "b88c50a9",
    "metadata": {
     "editable": true
    },
@@ -3741,7 +3677,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "74378773",
+   "id": "6b690bb5",
    "metadata": {
     "editable": true
    },
@@ -3753,7 +3689,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "70450254",
+   "id": "6282bb36",
    "metadata": {
     "editable": true
    },
@@ -3763,7 +3699,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "81a28b23",
+   "id": "abb9ade2",
    "metadata": {
     "editable": true
    },
@@ -3775,7 +3711,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "9a733356",
+   "id": "2eb5ab80",
    "metadata": {
     "editable": true
    },
@@ -3789,7 +3725,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "f469f486",
+   "id": "ed8cd165",
    "metadata": {
     "editable": true
    },
@@ -3801,7 +3737,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "7461e5e6",
+   "id": "e8ed463c",
    "metadata": {
     "editable": true
    },
@@ -3813,7 +3749,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "50a1b605",
+   "id": "271d5106",
    "metadata": {
     "editable": true
    },
@@ -3823,7 +3759,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "0cebce43",
+   "id": "fae74043",
    "metadata": {
     "editable": true
    },
@@ -3835,7 +3771,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2e4405bd",
+   "id": "4b3f62c9",
    "metadata": {
     "editable": true
    },
@@ -3847,7 +3783,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "2920aa4e",
+   "id": "e72956ae",
    "metadata": {
     "editable": true
    },
@@ -3857,7 +3793,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "bc4357b0",
+   "id": "8cc15d61",
    "metadata": {
     "editable": true
    },
@@ -3869,7 +3805,7 @@
   },
   {
    "cell_type": "markdown",
-   "id": "d9b66569",
+   "id": "2adb40ea",
    "metadata": {
     "editable": true
    },
@@ -3880,25 +3816,7 @@
    ]
   }
  ],
- "metadata": {
-  "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
-   "language": "python",
-   "name": "python3"
-  },
-  "language_info": {
-   "codemirror_mode": {
-    "name": "ipython",
-    "version": 3
-   },
-   "file_extension": ".py",
-   "mimetype": "text/x-python",
-   "name": "python",
-   "nbconvert_exporter": "python",
-   "pygments_lexer": "ipython3",
-   "version": "3.9.15"
-  }
- },
+ "metadata": {},
  "nbformat": 4,
  "nbformat_minor": 5
 }
diff --git a/doc/src/week41/week41.do.txt b/doc/src/week41/week41.do.txt
index 2dae7add5..cd27c48e6 100644
--- a/doc/src/week41/week41.do.txt
+++ b/doc/src/week41/week41.do.txt
@@ -10,8 +10,8 @@ DATE: Week 41
 ===== Material for the lecture on Monday October 6, 2025 =====
 o Neural Networks, setting up the basic steps, from the simple perceptron model to the multi-layer perceptron model.
 o Building our own Feed-forward Neural Network, getting started
-#  * Video of lecture notes at URL:""
-#  * Whiteboard notes at URL:"https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf"
+o Video of lecture notes at URL:"https://youtu.be/96Pe6O9Wn6g"
+o Whiteboard notes at URL:"https://github.com/CompPhysics/MachineLearning/blob/master/doc/HandWrittenNotes/2025/FYSSTKweek41.pdf"
 
 
 !split