diff --git a/slides/biomin.md b/slides/biomin.md
index 8b0e97386d7895d4b48c92e5c73132f97b49905c..ac68768d3c47c07f481743647e988d9a77a4f7ad 100644
--- a/slides/biomin.md
+++ b/slides/biomin.md
@@ -18,7 +18,7 @@ Microbes change the chemistry in a way that promotes the precipitation of calcit
 :::::: {.columns}
 ::: {.column width=75%}
 <video controls>
-<source src="img/biomin_MIP-timelapse.mp4" type="video/mp4"/>
+<source src="img/biomin_MIP-timelapse.ogg"/>
 </video>
 </br>
 <small>Credit: James Connolly, Montana State University.</small>
diff --git a/slides/img/biomin_MIP-timelapse.ogg b/slides/img/biomin_MIP-timelapse.ogg
new file mode 100644
index 0000000000000000000000000000000000000000..66298b22cdbb913d2241ca1510aba0bc2c8ce47c
Binary files /dev/null and b/slides/img/biomin_MIP-timelapse.ogg differ