diff --git a/python/1_1_Notebooks.ipynb b/python/1_1_Notebooks.ipynb
index 2292ce9..56b3da7 100644
--- a/python/1_1_Notebooks.ipynb
+++ b/python/1_1_Notebooks.ipynb
@@ -140,12 +140,25 @@
   },
   {
    "cell_type": "code",
-   "execution_count": null,
+   "execution_count": 5,
    "metadata": {
-    "collapsed": true
+    "collapsed": false
    },
-   "outputs": [],
-   "source": []
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "4"
+      ]
+     },
+     "execution_count": 5,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "2+2"
+   ]
   },
   {
    "cell_type": "markdown",
diff --git a/python/1_3_Sequences.ipynb b/python/1_3_Sequences.ipynb
index 6570794..460ab21 100644
--- a/python/1_3_Sequences.ipynb
+++ b/python/1_3_Sequences.ipynb
@@ -443,7 +443,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "Tuples are *inmutable* sequences, tipically used to store collections of heterogeneous data.\n",
+    "Tuples are *inmutable* sequences, typically used to store collections of heterogeneous data.\n",
     "\n",
     "The main difference from lists is that lists are *mutable* while tuples are *inmutable*. Thus, tuples have not methods such as insert(), pop(), remove() or append() to change them.\n",
     "\n",