diff --git a/cc-by-sa/knowledge/modules/history_of_type/lessons/fitting_the_line/content.md b/cc-by-sa/knowledge/modules/history_of_type/lessons/fitting_the_line/content.md
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@@ -89,8 +89,8 @@ Decades before Cheltenham, though, manufacturers of wood display type were cutti
diff --git a/cc-by-sa/knowledge/modules/history_of_type/lessons/fitting_the_line/images/fitting_the_line_8.jpg b/cc-by-sa/knowledge/modules/history_of_type/lessons/fitting_the_line/images/fitting_the_line_8.jpg
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diff --git a/cc-by-sa/knowledge/modules/history_of_type/lessons/the_tight_not_touching_style/content.md b/cc-by-sa/knowledge/modules/history_of_type/lessons/the_tight_not_touching_style/content.md
index e5c4c9ce7..b324d5c75 100644
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+++ b/cc-by-sa/knowledge/modules/history_of_type/lessons/the_tight_not_touching_style/content.md
@@ -1,6 +1,10 @@
In the 1960s, the introduction of photo-typesetting made it possible to set type tighter than ever before. Over the next two decades, designers like Herb Lubalin and Tom Carnase used this new ability in letter spacing to create a (very cool) new aesthetic called tight-not-touching. Read on to find out how this style came to be and how variable fonts make it easier to achieve the look today.
-**MISSING: Caption: Look how cool the work of 1960s designers like Herb Lubalin and Tom Carnase is. (Image courtesy of Flat File) Alt text: The word “fact:” in white on a black background**
+
## Letter spacing—linear scaling vs. optical scaling
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@@ -1 +1 @@
-
+
diff --git a/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/technical_challenges_for_typography_in_ar_vr/content.md b/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/technical_challenges_for_typography_in_ar_vr/content.md
index 7ff0d536c..b05782dae 100644
--- a/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/technical_challenges_for_typography_in_ar_vr/content.md
+++ b/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/technical_challenges_for_typography_in_ar_vr/content.md
@@ -54,7 +54,7 @@ Chromatic aberration is caused by lens dispersion, with different colors of ligh
@@ -67,7 +67,7 @@ This refers to the visible fine lines between pixels on a display, as if the use
diff --git a/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/type_selection_for_ar_vr/content.md b/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/type_selection_for_ar_vr/content.md
index 4d7d8146e..63084d71f 100644
--- a/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/type_selection_for_ar_vr/content.md
+++ b/cc-by-sa/knowledge/modules/using_type_in_ar_and_vr/lessons/type_selection_for_ar_vr/content.md
@@ -109,7 +109,7 @@ Typefaces with sturdy stroke endings tend to perform better over those with less