diff --git a/R_Bootcamp_Intro_R.ipynb b/R_Bootcamp_Intro_R.ipynb
index 5b10c11..f7f7498 100644
--- a/R_Bootcamp_Intro_R.ipynb
+++ b/R_Bootcamp_Intro_R.ipynb
@@ -441,7 +441,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "print( combined_vector[-c(4)]   )"
+    "print(combined_vector[-c(4)])"
    ]
   },
   {
@@ -649,7 +649,7 @@
    "metadata": {},
    "outputs": [],
    "source": [
-    "table( is.na( here_is_a_vector ) )"
+    "table(is.na(here_is_a_vector))"
    ]
   },
   {
@@ -987,6 +987,23 @@
     "str(unlist(list_1))"
    ]
   },
+  {
+   "cell_type": "markdown",
+   "metadata": {},
+   "source": [
+    "And also look at the difference in length between the original `list_1` and the vectorized `list_1`."
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "metadata": {},
+   "outputs": [],
+   "source": [
+    "print(length(list_1))\n",
+    "print(length(unlist(list_1)))\n"
+   ]
+  },
   {
    "cell_type": "markdown",
    "metadata": {},
@@ -1652,7 +1669,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "So, the function itself is called `roll`, it takes the argument or formals `number_of_dice` and the body of the function uses the built-in `sample` function in R to simulate dice rolls (use ?sample to learn more about the `sample()` function). "
+    "So, the function itself is called `roll`, it takes the argument or formals `number_of_dice` and the body of the function uses the built-in `sample` function in R to simulate dice rolls (use `?sample` to learn more about the `sample()` function). "
    ]
   },
   {