Physics in Blender

Since Blender has a game engine, it is able to simulate real world physics. An example can be seen here.

http://www.opendimension.org/blender3d_en/arch_pressure.php

This particular blender file simulates an arch made from stones. Pieces of stones can be moved around so as to see how it would affect the stability of the arch. Such laws of physics would be very useful when simulating architecture.