diff --git a/source/ch-jupyter.ptx b/source/ch-jupyter.ptx
index a9799bc..97ae807 100644
--- a/source/ch-jupyter.ptx
+++ b/source/ch-jupyter.ptx
@@ -133,105 +133,4 @@ I've provided a
 that you can upload to your Codespace to experiment with.
     </p>
   </section>
-</chapter><?xml version='1.0' encoding='utf-8'?>
-<chapter xml:id="ch-jupyter">
-  <title>Jupyter Notebooks</title>
-  <introduction>
-    <p>
-In <xref ref="sec-run-code"/> you wrote and ran a few short
-scripts in various programming languages. But often, we want
-to not only be able to write and execute code, but do so
-piece-by-piece, and share the results with other people
-without requiring them to run the code themselves...
-    </p>
-  </introduction>
-  <section xml:id="sec-intro-to-jupyter">
-    <title>Intro to Jupyter</title>
-    <definition xml:id="def-jupyter">
-      <statement>
-        <p>
-A <term>Jupyter notebook</term> is a file that stores
-commentary, code, and output in an all-in-one format suitable for
-sharing with other people.
-        </p>
-      </statement>
-    </definition>
-    <p>
-Jupyter is a popular open-source tool used in
-data science, scientific computing, and computational journalism.
-GitHub provides a Codespace ready for running Jupyter notebooks
-out of the box:
-<url href="https://github.com/github/codespaces-jupyter/"/>.
-    </p>
-  </section>
-  <section xml:id="sec-github-codespaces-jupyter">
-    <title>GitHub's Jupyter Codespace</title>
-    <p>
-Let's begin by going to
-<url href="https://github.com/github/codespaces-jupyter/">
-  github/codespaces-jupyter</url>
-directly. Before we dive into editing a notebook ourselves,
-we can first browse the <c>notebooks</c> directory on
-the repository page. We see three files, each with the
-extension <c>*.ipynb</c>
-(short for <q><em>IPY</em>thon <em>N</em>ote<em>B</em>ook</q>,
-Jupyter's original name).
-    </p>
-    <p>
-Clicking on each file, you'll note that while there's code,
-most of the file is actually narrative and visualization.
-That's the appeal of Jupyter for many people: it's about
-communicating <em>stories</em>, not just data or software.
-    </p>
-    <p>
-Additionally, you'll see a <c>data</c> directory, which
-includes a <c>*.csv</c> <em>C</em>omma <em>S</em>eparated
-<em>V</em>alues spreadsheet. This file can be read into a
-notebook for analysis.
-    </p>
-    <p>
-Now, let's follow the instructions of the repository's
-README file (<xref ref="remark-readme"/>).
-    </p>
-  </section>
-  <!-- <section>
-    <p>
-      To get started, create a Codespace
-      (<xref ref="note-create-codespace"/>)
-      on either an existing or new repository
-      (<xref ref="sec-creating-the-repo"/>).
-      You can then create a Jupyter notebook file named
-      <c>notebook.ipynb</c>.
-          </p>
-          <note xml:id="note-provision-notebook">
-            <p>
-      In a Codespace, any file with the extension 
-      will be treated as a
-      Jupyter notebook. When opening this file, you'll see a notebook
-      interface, and be prompted to
-      <q>install the recommended 'Python' extension</q> if it's
-      not already enabled - do this.
-            </p>
-            <p>
-      Then in your notebook file, click the <q>Select Kernel</q>
-      button, then <q>Install/Enable suggested extensions</q> for
-      Python+Jupyter. You should then have the option to select
-      a <q>Python environment</q> such as <c>Python 3.*.*</c>.
-            </p>
-            <p>
-      If successful, you should be able to enter
-      <c>import sys; print(sys.version)</c> into the displayed
-      text box,
-      and see the result of executing it with
-      <kbd>Shift</kbd>+<kbd>Enter</kbd>.
-            </p>
-          </note>
-          <p>
-      There are plenty of existing tutorials on the internet to help you
-      get acquainted with Python and Jupyter now that you have them
-      available to you in your Codespace. But to get you started, I've provided
-      one <dataurl source="first-notebook.ipynb">sample notebook</dataurl>
-      that you can upload to your Codespace to break the ice.
-          </p>
-  </section> -->
 </chapter>
\ No newline at end of file