When I was 12 my wrestling coach was getting his PHD in fluid dynamics. He gave a tour of the lab where he worked. On screen was a simulation. He explained that they fly a plane back and forth through a certain column of air in the stratosphere to get starting data. Then, using his model he predicts what the flow will look like over a period of time. There were specks flowing through the space onscreen. I asked what they were. “Bugs” he said. Six years later I was sitting in the library studying and I slapped my forehead. “Bugs! Of course! Ha!”