diff --git a/04-visualization-ggplot2.md b/04-visualization-ggplot2.md
index c9746a0d..10940a44 100644
--- a/04-visualization-ggplot2.md
+++ b/04-visualization-ggplot2.md
@@ -316,7 +316,7 @@ better distribute the observations in the space of the plot.  Changing the scale
 of the axes is done similarly to adding/modifying other components (i.e., by
 incrementally adding commands). Try making these modifications:
 
-- Represent weight on the log~~10~~ scale; see `scale_y_log10()`.
+- Represent weight on the log~10~ scale; see `scale_y_log10()`.
 
 :::::::: solution
 
diff --git a/fig/04-visualization-ggplot2-rendered-boxplot-with-points-1.png b/fig/04-visualization-ggplot2-rendered-boxplot-with-points-1.png
index 820a4979..a0743ffa 100644
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diff --git a/fig/04-visualization-ggplot2-rendered-unnamed-chunk-10-1.png b/fig/04-visualization-ggplot2-rendered-unnamed-chunk-10-1.png
index f1030e92..008f676a 100644
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diff --git a/fig/04-visualization-ggplot2-rendered-unnamed-chunk-11-1.png b/fig/04-visualization-ggplot2-rendered-unnamed-chunk-11-1.png
index 15c87045..2e4213b8 100644
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diff --git a/fig/04-visualization-ggplot2-rendered-unnamed-chunk-9-1.png b/fig/04-visualization-ggplot2-rendered-unnamed-chunk-9-1.png
index 48e91c1a..8bcc872e 100644
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diff --git a/md5sum.txt b/md5sum.txt
index ddbb72bd..d0193d97 100644
--- a/md5sum.txt
+++ b/md5sum.txt
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