One is how a zipper works. The other is the precise function of Bernard Baruch. There's nothing to writing. All you do is sit down at a typewriter and open a vein. Many questions are unanswerable.
Many answers are questionable.
Never be afraid to try something new. Remember that amateurs built the Ark and professionals built the Titanic. Here are some images of steadily traveling water waves from recent work related to the KP equation. Katharine F. Gurski , PhD 1999. Decay rates of internal waves in viscous near-critical fluids.