diff --git a/.DS_Store b/.DS_Store
index 674609bdd..622072bea 100644
Binary files a/.DS_Store and b/.DS_Store differ
diff --git a/math1052/images/lect-06/cool-hot.ggb b/math1052/images/lect-06/cool-hot.ggb
new file mode 100644
index 000000000..62dbe3fc8
Binary files /dev/null and b/math1052/images/lect-06/cool-hot.ggb differ
diff --git a/math1052/images/lect-06/ice-block-removebg-preview.png b/math1052/images/lect-06/ice-block-removebg-preview.png
new file mode 100644
index 000000000..952b5fc49
Binary files /dev/null and b/math1052/images/lect-06/ice-block-removebg-preview.png differ
diff --git a/math1052/images/lect-06/pie-removebg-preview.png b/math1052/images/lect-06/pie-removebg-preview.png
new file mode 100644
index 000000000..a5450f2e0
Binary files /dev/null and b/math1052/images/lect-06/pie-removebg-preview.png differ
diff --git a/math1052/lecture-06.html b/math1052/lecture-06.html
index 1d46dabff..2aabf439d 100644
--- a/math1052/lecture-06.html
+++ b/math1052/lecture-06.html
@@ -178,8 +178,8 @@ <h5>1 Ordinary Differential Equations</h5>
 						<div class="left-txt">
 							<p>
 								<span>
-									Here the constant $k$ is chosen such that if $T>T_m$, $T'(t)$ is
-negative, describing cooling.
+									Here the constant $k$ is chosen such that if $T>T_m,$ $T'(t)$ is
+									negative, describing cooling.
 								</span>
 							</p>