From The Action Lab , and Action Lab Shorts.

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A good video by Eric Heller, one of the original researchers on branched flow:

Simulation of branched flow you can play with yourself
https://phydemo.app/ray-optics/simulator/

Some sources for branched flow
https://physicstoday.aip.org/features/branched-flow
https://www.blochbusters.com/learn-with-us/lecture-notes/branched-flow/
https://www.nature.com/articles/nphys756