diff --git a/01_materials/slides/10_numpy.ipynb b/01_materials/slides/10_numpy.ipynb
index ebd0e056..07b0da98 100644
--- a/01_materials/slides/10_numpy.ipynb
+++ b/01_materials/slides/10_numpy.ipynb
@@ -94,7 +94,7 @@
     },
     {
       "cell_type": "code",
-      "execution_count": null,
+      "execution_count": 1,
       "id": "cea5f938",
       "metadata": {
         "id": "cea5f938"
@@ -179,7 +179,7 @@
         "id": "19868422"
       },
       "source": [
-        "We can create arrays with placeholder content in several ways. This is useful when we know how many elements will be in an array, but not their values, as `numpy` arrays have fixed size. The full list is in [`numpy`'s documentation](https://numpy.org/devdocs/user/basics.creation.html#arrays-creation)."
+        "We can create arrays with placeholder content in several ways. This is useful when we know how many elements will be in an array, but not their values, as `numpy` arrays have fixed size. You can find other methods for array creation in [`numpy`'s documentation](https://numpy.org/devdocs/user/basics.creation.html#arrays-creation)."
       ]
     },
     {
@@ -239,7 +239,7 @@
       },
       "outputs": [],
       "source": [
-        "# create a 1D array from 1 until 10 in steps of 2\n",
+        "# create a 1D array from 1 to 10 in steps of 2\n",
         "np.arange(1, 10, 2)"
       ]
     },
@@ -1231,7 +1231,7 @@
         "id": "bae12ead"
       },
       "source": [
-        "To filter use a Boolean expression as a mask, pass it into square brackets after the array to mask."
+        "To filter an array, we pass the mask (e.g., `tens % 3 == 0`) as the array index:"
       ]
     },
     {
@@ -1546,7 +1546,7 @@
       "provenance": []
     },
     "kernelspec": {
-      "display_name": "Python 3 (ipykernel)",
+      "display_name": "python-env",
       "language": "python",
       "name": "python3"
     },
@@ -1560,7 +1560,7 @@
       "name": "python",
       "nbconvert_exporter": "python",
       "pygments_lexer": "ipython3",
-      "version": "3.11.8"
+      "version": "3.11.14"
     },
     "rise": {
       "scroll": true,