Three Double Pendulums Show Chaotic Divergence

A Python simulation of three double pendulums whose starting angles differ by a billionth of a radian: they stay nearly in sync for the first 12.7 seconds, then rapidly part ways — a direct demonstration of chaos. The prompt specifies exact physical parameters and requires 40 seconds of state output at 30 fps, but leaves out the visualization and rendering. The author reports the energy drift stays minimal over the 40 seconds. A good fit for physics explainers and short videos on chaos theory.