i’m very hard i’m soft

But sand had other, devious ways of driving us mad, like defying all reason. The sand
would accelerate inside the tube and then sporadically stop accelerating, come to a near
halt, and then continue on its merry way. How the hell does one model sand
mathematically? Is it a fluid? Kinda but no. Is it a solid? Definitely not. Sand defies all
reason and logic.

I attempted to apply fluid dynamics to the sand so I could model this mysterious
behaviour that retarded the flow. I hypothesised that sand in a tube was some kind of
fluid that could only flow in a laminar fashion. But it’s ever shifting and seemingly
maliciously random behaviour made the calculation of an accurate Reynolds number
equivalent nearly impossible.