diff --git a/lectures/lx_energysrc.md b/lectures/lx_energysrc.md
index 5b384ca..4eec3e7 100644
--- a/lectures/lx_energysrc.md
+++ b/lectures/lx_energysrc.md
@@ -55,6 +55,8 @@ Introduction to **Energy Harvesting**
 
 <!--pan_doc:
 
+<iframe width="560" height="315" src="https://www.youtube.com/embed/Tb2CFHLmkzw?si=4f29EI_Hwj3My9fn" title="YouTube video player" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" referrerpolicy="strict-origin-when-cross-origin" allowfullscreen></iframe>
+
 Integrated circuits are wasteful of energy. Digital circuits charge transistor gates to change states, and when
 discharged, the charges are dumped to ground. In analog circuits the transconductance requires a DC current,
 a continuous flow of charges from positive supply to ground. 
@@ -80,7 +82,8 @@ In the context of energy harvesting, there is energy in electromagnetic fields,
 
 -->
 
-![fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/6287639/8600701/8762143/shirv5-2928523-large.gif)
+<!--[fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/6287639/8600701/8762143/shirv5-2928523-large.gif)-->
+![fit](../media/shirv5-2928523-large.gif)
 
 ---
 
@@ -92,7 +95,8 @@ As devices approach average power consumption of $\mu W$ it becomes possible to
 
 -->
 
-![fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/6287639/8600701/8762143/shirv6-2928523-large.gif)
+<!--[fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/6287639/8600701/8762143/shirv6-2928523-large.gif)-->
+![fit](../media/shirv6-2928523-large.gif)
 
 ---
 
@@ -107,7 +111,8 @@ Technologies like Bluetooth LE, however, can approach < 10 $\mu$W for some appli
 
 -->
 
-![inline fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/6287639/8600701/8762143/shirv11-2928523-large.gif)
+<!--[inline fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/6287639/8600701/8762143/shirv11-2928523-large.gif)-->
+![inline fit](../media/shirv11-2928523-large.gif)
 
 
 <!--pan_doc:
@@ -641,7 +646,8 @@ Below is a custom triboelectric material that converts friction into a sparse el
 
 -->
 
-![fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo6ab-3080383-large.gif)
+<!--[fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo6ab-3080383-large.gif)-->
+![fit](../media/yoo6ab-3080383-large.gif)
 
 ---
 
@@ -652,7 +658,9 @@ Once the voltage is high enough, then a temperature sensor is started.
 
 -->
 
-![fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo1ab-3080383-large.gif)
+<!--[fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo1ab-3080383-large.gif)-->
+
+![fit](../media/yoo1ab-3080383-large.gif)
 
 ---
 
@@ -669,10 +677,15 @@ It's academia's job to prove that something could be possible. It's industry's j
 
 -->
 
-![inline fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo2-3080383-large.gif)
+<!--
+[inline fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo2-3080383-large.gif)
+
+[inline fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo3-3080383-large.gif)
+-->
 
+![inline fit](../media/yoo2-3080383-large.gif)
 
-![inline fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo3-3080383-large.gif)
+![inline fit](../media/yoo3-3080383-large.gif)
 
 
 ---
@@ -703,7 +716,8 @@ a charge storage device, either a battery, or a capacitor.
 
 -->
 
-![fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo4-3080383-large.gif)
+<!--[fit](https://ieeexplore.ieee.org/mediastore_new/IEEE/content/media/4/9546917/9441315/yoo4-3080383-large.gif)-->
+![fit](../media/yoo4-3080383-large.gif)
 
 
 ---
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diff --git a/pdf/aic.tex b/pdf/aic.tex
index e9fcc06..115d735 100644
--- a/pdf/aic.tex
+++ b/pdf/aic.tex
@@ -111,8 +111,8 @@ \chapter{Low Power Radio}
 %\chapter{Analog SystemVerilog}
 %\input{lecture_11_-_analog_systemverilog_fiximg.tex}
 
-%\chapter{Energy Sources}
-%\input{lecture_x_-_energy_sources_fiximg.tex}
+\chapter{Energy Sources}
+\input{lecture_x_-_energy_sources_fiximg.tex}
 
 %\chapter{What I expect you to know}
 %\input{what_i_expect_you_to_already_know.latex}
diff --git a/pdf/version.tex b/pdf/version.tex
index aa54abb..248e50f 100644
--- a/pdf/version.tex
+++ b/pdf/version.tex
@@ -1,2 +1,2 @@
-{\noindent Built on Sun Mar 10 14:27:04 CET 2024} \\ 
- {\noindent from 1a8929bded921dd08fb2d3077916259b41a7337a}
+{\noindent Built on Mon Apr  1 17:52:22 CEST 2024} \\ 
+ {\noindent from 9607c2cee4212712dd0eb8806cd3a9e72b8aad81}