Update biofoam.md

docs/files/recipes/biofoam.md

@@ -213,7 +213,7 @@ The biofoam feels like the foam-like packaging materials sometimes used for ship
 
 ### Tactility & sound impression
 
-[youtube embed here]
+<iframe width="560" height="315" src="https://www.youtube.com/embed/zF549LrD2Nc" frameborder="0" allow="accelerometer; autoplay; encrypted-media; gyroscope; picture-in-picture" allowfullscreen></iframe>
 
 ## About this entry