diff --git a/content/ch/02/data_scope_big_data_hubris.ipynb b/content/ch/02/data_scope_big_data_hubris.ipynb
index 349f5587..8c3fdd00 100644
--- a/content/ch/02/data_scope_big_data_hubris.ipynb
+++ b/content/ch/02/data_scope_big_data_hubris.ipynb
@@ -53,7 +53,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Example: Google Flu Trends\n",
+    "## Example: Google Flu Trends\n",
     "\n",
     "[Digital epidemiology](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5754279/), a new subfield of epidemiology, leverages data generated outside the public health system to study patterns of disease and health dynamics in populations.\n",
     "The Google Flu Trends (GFT) tracking system was one of the earliest examples of digital epidemiology.\n",
diff --git a/content/ch/11/viz_context.ipynb b/content/ch/11/viz_context.ipynb
index 43d169ab..e9acf590 100644
--- a/content/ch/11/viz_context.ipynb
+++ b/content/ch/11/viz_context.ipynb
@@ -140,7 +140,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "# Example: 100m Sprint Times"
+    "## Example: 100m Sprint Times"
    ]
   },
   {