<command arg="-root"/>
- <video href="http://www.youtube.com/watch?v=wcdKHCp9foY"/>
+ <video href="https://www.youtube.com/watch?v=wcdKHCp9foY"/>
<!-- #### -color [random] -->
<_description>
2D meta-balls: overlapping and merging balls with fuzzy edges.
-http://en.wikipedia.org/wiki/Metaballs
+https://en.wikipedia.org/wiki/Metaballs
Written by W.P. van Paassen; 2003.
</_description>