diff --git a/src/epp_topics/python_basics/assignment_and_scalar_types/objectives_materials.ipynb b/src/epp_topics/python_basics/assignment_and_scalar_types/objectives_materials.ipynb
index 6b12a61..a113a95 100644
--- a/src/epp_topics/python_basics/assignment_and_scalar_types/objectives_materials.ipynb
+++ b/src/epp_topics/python_basics/assignment_and_scalar_types/objectives_materials.ipynb
@@ -97,36 +97,35 @@
     "    },\n",
     "    {\n",
     "        \"question\": (\n",
-    "            \"\"\"You want to convert a date that you stored as the following\n",
-    "        string \"2021-01-01\" to a float object. Which of the following codes do\n",
-    "                     you think will do this (try on a notebook if you want)?\"\"\"\n",
+    "            \"\"\"You want to convert a number that you stored as the following\n",
+    "        string \"200,000.000\" to a float object corresponding to the number 200000.0.\n",
+    "        Which of the following codes do you think will do this (try on a notebook if\n",
+    "        you want)?\"\"\"\n",
     "        ),\n",
     "        \"type\": \"multiple_choice\",\n",
     "        \"answers\": [\n",
     "            {\n",
-    "                \"answer\": 'float(\"2021-01-01\")',\n",
-    "                \"correct\": False,\n",
-    "                \"feedback\": \"Incorrect. The characters - cannot be handled by float().\",\n",
+    "                \"answer\": 'float(\"200,000.000\".replace(\",\", \"\"))',\n",
+    "                \"correct\": True,\n",
+    "                \"feedback\": \"Correct.\",\n",
     "            },\n",
     "            {\n",
-    "                \"answer\": \"float(2021-01-01)\",\n",
+    "                \"answer\": 'float(\"200,000.000\")',\n",
     "                \"correct\": False,\n",
-    "                \"feedback\": \"\"\"Incorrect. Inputting 2021-01-01 without \\\" treats it\n",
-    "                like a float, and floats cannot include special characters.\"\"\",\n",
+    "                \"feedback\": \"\"\"Incorrect. This would yield a wrong result. Furthermore,\n",
+    "                commas are not allowed in the float() function.\"\"\",\n",
     "            },\n",
     "            {\n",
-    "                \"answer\": \"\"\"date = \\\"2021-01-01\\\".replace(\\\"-\\\", \\\".\\\") \\n\n",
-    "             date = float(date)\"\"\",\n",
-    "                \"correct\": True,\n",
-    "                \"feedback\": \"\"\"Correct. Replace\n",
-    "             remove all \\\" - \\\" characters to that the string can be handled\n",
-    "             by float().\"\"\",\n",
+    "                \"answer\": \"\"\"float(\"200,000.000\".replace(\".\", \"\"))\"\"\",\n",
+    "                \"correct\": False,\n",
+    "                \"feedback\": \"\"\"Incorrect. This would yield a wrong result.\n",
+    "                Furthermore, commas are not allowed in the float() function.\"\"\",\n",
     "            },\n",
     "            {\n",
-    "                \"answer\": \"This cannot be done.\",\n",
+    "                \"answer\": 'float(\"200,000.000\".replace(\",\", \"\").replace(\".\", \"\"))',\n",
     "                \"correct\": False,\n",
-    "                \"feedback\": \"\"\"Incorrect. Not everything can be done, but when it is\n",
-    "                 about converting objects, tere is usually a quick way.\"\"\",\n",
+    "                \"feedback\": \"\"\"Incorrect. This code will execute, but the resulting\n",
+    "                float will be 200000000.0.\"\"\",\n",
     "            },\n",
     "        ],\n",
     "    },\n",
@@ -173,6 +172,7 @@
     "        ],\n",
     "    },\n",
     "]\n",
+    "\n",
     "display_quiz(content, colors=\"fdsp\")"
    ]
   }
diff --git a/src/epp_topics/scientific_computing/indexing/objectives_materials.ipynb b/src/epp_topics/scientific_computing/indexing/objectives_materials.ipynb
index 4c90221..5eec5db 100644
--- a/src/epp_topics/scientific_computing/indexing/objectives_materials.ipynb
+++ b/src/epp_topics/scientific_computing/indexing/objectives_materials.ipynb
@@ -64,7 +64,7 @@
     "        \"List indexing is more flexible but array indexing is faster\": False,\n",
     "        \"Array indexing generalizes to higher dimensions\": True,\n",
     "    },\n",
-    "    \"If you have a two dimensional array, then your_array(4) returns\": {\n",
+    "    \"If you have a two dimensional array, then your_array[4] returns\": {\n",
     "        \"An error message unless your array has 4 rows\": True,\n",
     "        \"The forth column\": False,\n",
     "        \"The forth element of the first row\": False,\n",