diff --git a/01_introduction.ipynb b/01_introduction.ipynb
index 7ffecd1128b34a0a6e98bfd65f6eec2b90388f92..f66e1b6637e275d173e7be32b2c230d02b08f427 100644
--- a/01_introduction.ipynb
+++ b/01_introduction.ipynb
@@ -1840,7 +1840,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.2"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
diff --git a/02_classification.ipynb b/02_classification.ipynb
index 20ec770a08a75f9c5556ae7d0f47f18a8944f323..06bd63bcfee78f4f27a21595cd8f080b41562fb6 100644
--- a/02_classification.ipynb
+++ b/02_classification.ipynb
@@ -169,7 +169,7 @@
    "cell_type": "code",
    "execution_count": 2,
    "metadata": {
-    "scrolled": true
+    "scrolled": false
    },
    "outputs": [
     {
@@ -601,7 +601,7 @@
    "source": [
     "<div class=\"alert alert-block alert-warning\">\n",
     "<p><i class=\"fa fa-warning\"></i>&nbsp;\n",
-    "Eventually, classification is about finding a procedure to separate point clouds in a n-dimesional space.\n",
+    "Eventually, classification is about finding a procedure to separate point clouds in a n-dimensional space.\n",
     "</p>\n",
     "</div>\n",
     "\n",
@@ -700,7 +700,7 @@
     "     weight_x * x + weight_y * y = threshold\n",
     "     \n",
     "\n",
-    "defines a line in 2D space. Points fulfilling\n",
+    "can be rearranged to the form `y = m * x  n` and thus defines a line in 2D space. Points fulfilling\n",
     "\n",
     "     weight_x * x + weight_y * y < threshold\n",
     "      \n",
@@ -2131,7 +2131,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.2"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
diff --git a/03_overfitting_and_cross_validation.ipynb b/03_overfitting_and_cross_validation.ipynb
index 7e3d3f659d82c9ac161995503172cbdae814dd66..2fc879894b49d69ab11f3e1378bf916a2248a050 100644
--- a/03_overfitting_and_cross_validation.ipynb
+++ b/03_overfitting_and_cross_validation.ipynb
@@ -1798,7 +1798,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.2"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,
diff --git a/04_measuring_quality_of_a_classifier.ipynb b/04_measuring_quality_of_a_classifier.ipynb
index 1917213f83124a081f8aaf10a45abd8d4e42f3a2..6d710bcb426b28480c9a376bc021f03878a2a9a7 100644
--- a/04_measuring_quality_of_a_classifier.ipynb
+++ b/04_measuring_quality_of_a_classifier.ipynb
@@ -834,7 +834,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.7.4"
+   "version": "3.7.2"
   },
   "latex_envs": {
    "LaTeX_envs_menu_present": true,