As far as natural rules, I wonder if the magnetic fields of atoms or groups of atoms in molecules play roles in ultimately determining behavior of organisms on a macroscopic level. How does an animal know what the rules are? How do ants cooperate without being taught. There is a video I show my chemistry students and AP biology kids about how molecules self-assemble to create complex patterns following the rules of magnetism. Here is a link to the self assembly lab at MIT where the researches discuss self assembly and its role in future engineering manufacturing. I show this to my students to tie in ideas like Coulomb's law, and the self assembly of molecules based on charges and magnetic fields:
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