1.   By lowering a polyethylene pipe into Lake Nyos, the team has allowed gas-rich water at the lake bottom to froth up in a great fountain.

2.   Indeed, one of the points of the show is that short water supplies have never discouraged the building of great fountains.

3.   Not that it would have been a great fountain.

4.   The great Apollo fountain at Versailles shows his four horses cresting the waves.