<command arg="-root"/>
- <video href="http://www.youtube.com/watch?v=ZH1ZtfId0iA"/>
+ <video href="https://www.youtube.com/watch?v=ZH1ZtfId0iA"/>
<hgroup>
<vgroup>
<_description>
Simulates two dimensional incompressible inviscid fluid flow.
-http://en.wikipedia.org/wiki/Euler_equations_%28fluid_dynamics%29
-http://en.wikipedia.org/wiki/Inviscid_flow
+https://en.wikipedia.org/wiki/Euler_equations_%28fluid_dynamics%29
+https://en.wikipedia.org/wiki/Inviscid_flow
Written by Stephen Montgomery-Smith; 2002.
</_description>