Nature does not waste. Light bends through a prism along the fastest possible path. Planets trace ellipses rather than spirals because ellipses cost less energy to maintain. Mechanical systems, from pendulums to galaxies, follow paths of least action. This is not coincidence or aesthetic preference — it is the deepest operating principle of the physical universe. And remarkably, the same logic runs through every cell, organ, and lifetime of a human being. The principle of optimality states that any system navigating from one state to another will, given sufficient time and freedom, converge on the most efficient path available. In mathematics, this is formalized precisely: among all possible trajectories a controllable system might follow, certain ones are superior — minimizing cost, time, or resource expenditure. What makes this principle arresting is not its mathematical elegance but its universality. It does not stop at physics. It continues, unbroken, into biology. The...
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