Fluid mechanics guys are nuts, I can’t believe people can write the mathematical equations that govern stuff like this, it’s easily the most impressive and understated area of physics imo.

“An example of viscous fingering in a Hele-Shaw cell.”

haha

As a consequence of the incompressibility of the flow and Darcy’s law, the pressure fields must be harmonic…

Every time I start to feel complacent with my ignorance of complex analysis, another harmonic function pops out of the woodwork.

Wow. That’s why liquid glue looks like this when you remove the things you glue. Interesting.