diff --git a/05 - IPython Notebook.ipynb b/05 - IPython Notebook.ipynb
index 7d8a8e98b1bedd068895ff3d1d8db9341a721066..6988ad77bb9e240416cebcd9ae8605b2016576b1 100644
--- a/05 - IPython Notebook.ipynb	
+++ b/05 - IPython Notebook.ipynb	
@@ -39,7 +39,7 @@
      "level": 2,
      "metadata": {},
      "source": [
-      "Requirements on scientific computing"
+      "Requirements on scientific computing\n"
      ]
     },
     {
@@ -820,7 +820,7 @@
      "level": 1,
      "metadata": {},
      "source": [
-      "\u00a7 Excercise : My first Notebook (1)"
+      "\u00a7 Exercise : My first Notebook (1)"
      ]
     },
     {
@@ -837,7 +837,7 @@
       "  - Click on the current name (Untitled1) and edit this\n",
       "\n",
       "Add the code shown below to some **_code_** cells\n",
-      "  - Add cells by pressen the '+' button or ALT+ENTER\n",
+      "  - Add cells by pressing the '+' button or ALT+ENTER\n",
       "  - Remember the keyboard shortcuts or the help function ('h')\n",
       "\n",
       "\n",
@@ -1219,7 +1219,7 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      "- Notebook has acceess to all the files down in the directory"
+      "- Notebook has access to all the files down in the directory"
      ]
     },
     {
@@ -1245,7 +1245,7 @@
      "metadata": {},
      "source": [
       "<br></br><br></br>\n",
-      "Some other examples:"
+      "Embed videos using python code"
      ]
     },
     {
@@ -1284,7 +1284,7 @@
        "output_type": "pyout",
        "prompt_number": 1,
        "text": [
-        "<IPython.lib.display.YouTubeVideo at 0x3224890>"
+        "<IPython.lib.display.YouTubeVideo at 0x23c2890>"
        ]
       }
      ],
@@ -1295,7 +1295,7 @@
      "level": 1,
      "metadata": {},
      "source": [
-      "Plotting with matplotlib"
+      "Output plots with matplotlib "
      ]
     },
     {
@@ -1333,7 +1333,7 @@
      "level": 1,
      "metadata": {},
      "source": [
-      "\u00a7 Excercise : My first Notebook (2)"
+      "\u00a7 Exercise : My first Notebook (2)"
      ]
     },
     {
@@ -1358,15 +1358,18 @@
      ]
     },
     {
-     "cell_type": "markdown",
-     "metadata": {},
-     "source": [
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
       "### My next notebook\n",
       "\n",
       "This notebook is my first notebook with some experimental code.\n",
       "\n",
       "Author: [Michiel van Galen](mailto:m.van_galen@lumc.nl)"
-     ]
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": []
     },
     {
      "cell_type": "markdown",
@@ -1442,7 +1445,7 @@
      "level": 1,
      "metadata": {},
      "source": [
-      "\u00a7 Excercise : My first Notebook (3)\n",
+      "\u00a7 Exercise : My first Notebook (3)\n",
       "    "
      ]
     },
@@ -1475,14 +1478,18 @@
      "cell_type": "markdown",
      "metadata": {},
      "source": [
-      " - Think of function which can test if a sequence is palindromic\n",
+      " - Think of a function which can test if a sequence is palindromic\n",
       "   - Use the functions 'complement' and 'reverse'\n",
       " - Nicely formatted mardown cell(s) explaining the notebook\n",
       "   - Add links as references like the one above\n",
       "\n",
       "**Bonus: Write a function which can test if there are short palindromic sequences in a longer piece of DNA**\n",
       "\n",
-      "- Try to find the palindromic seqeuences of at least length 6 in the sequence : GGGAGACATGTCTAACCGTTGTAAAA\n",
+      "- Try to find the palindromic sequences of at least length 6 in the sequence :\n",
+      "  -GGGAGACATGTCTAACCGTTGTAAAA\n",
+      "  \n",
+      "Hints:\n",
+      "\n",
       "- Implement your current functions in a new function\n",
       "- Begin to iterate over a sequence and find a palindrome of size 2\n",
       "- Continue to work from there and expand your test\n",