diff --git a/chapter_01_elements/02_content.ipynb b/chapter_01_elements/02_content.ipynb
index ae9459c..ea72a59 100644
--- a/chapter_01_elements/02_content.ipynb
+++ b/chapter_01_elements/02_content.ipynb
@@ -24,7 +24,11 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "In this second part of Chapter 1, we look a bit closer into how the memory works and introduce a couple of \"theoretical\" terms."
    ]
@@ -1089,14 +1093,22 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
    "source": [
     "## How Python reads \"Commands\""
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "As we saw in the previous `list` example, it is important to understand in what order Python executes the \"commands\" (= not an officially used term) we give it. In this last section of the chapter, we introduce a classification scheme and look at its implications."
    ]
@@ -1157,7 +1169,11 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "... parsing the literal `42` creates a *new* `int` object and returns a reference to it (Note: for optimization reasons, the CPython implementation may already have a `42` object in memory)."
    ]
@@ -1400,7 +1416,7 @@
    "execution_count": 48,
    "metadata": {
     "slideshow": {
-     "slide_type": "skip"
+     "slide_type": "fragment"
     }
    },
    "outputs": [
@@ -1418,14 +1434,22 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
    "source": [
     "### Logical vs. Physical Lines"
    ]
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "How many lines of code does the next cell constitute?"
    ]
@@ -1433,7 +1457,11 @@
   {
    "cell_type": "code",
    "execution_count": 49,
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
    "outputs": [
     {
      "name": "stdout",
@@ -1449,7 +1477,11 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "The answer depends on how we are counting. If we count the number of lines of written source code, the answer is *one*. This gives us the number of **physical lines**. On the contrary, if we count the number of statements separated by the `;`, the answer is *two*. This gives us the number of **logical lines**.\n",
     "\n",
@@ -1459,7 +1491,11 @@
   {
    "cell_type": "code",
    "execution_count": 50,
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "fragment"
+    }
+   },
    "outputs": [
     {
      "name": "stdout",
@@ -1476,7 +1512,11 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "It is also possible to write a single logical line over several physical ones. The cell below is yet another physical representation of the same *two* logical lines. Any pair of delimiters, like `(` and `)` below, can be used to \"format\" the code in between with whitespace. The style guides mentioned before should still be taken into account (i.e., indent with 4 spaces)."
    ]
@@ -1484,7 +1524,11 @@
   {
    "cell_type": "code",
    "execution_count": 51,
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "fragment"
+    }
+   },
    "outputs": [
     {
      "name": "stdout",
@@ -1504,7 +1548,11 @@
   },
   {
    "cell_type": "markdown",
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "skip"
+    }
+   },
    "source": [
     "Another situation, in which several physical lines are treated as a logical one, is with so-called **[compound statements <img height=\"12\" style=\"display: inline-block\" src=\"../static/link/to_py.png\">](https://docs.python.org/3/reference/compound_stmts.html)**. In contrast to simple statements like `=` and `del` above, the purpose of compound statements is to group other statements.\n",
     "\n",
@@ -1516,7 +1564,11 @@
   {
    "cell_type": "code",
    "execution_count": 52,
-   "metadata": {},
+   "metadata": {
+    "slideshow": {
+     "slide_type": "slide"
+    }
+   },
    "outputs": [
     {
      "name": "stdout",