Ah, but you’re calculating the area, so it would be length * width, not just multiplying by 2.

So you’re looking at 25 at the bottom and 49 at the top, making your average 37 per layer.

Not sure where you’d land at 12 nuts per layer on average. If you go off 5 nuts “wide” as your diameter you’d end up with at least 20 nuts at the bottom layer (area = π(5/2)² = 19.6).

I have never heard the phrase “runs on the edge”, and the article uses some form of it a half dozen times.

My only results for “edge devices” refer to networking. Is that what they’re trying to say?