Nature — the original computer
Before there were minds, the universe was already computing itself.
The universe's algorithm is shockingly compact. The Lagrangian of the Standard Model fits on a t-shirt; combined with general relativity it produces every star, every coastline, every conversation. Nature does not need training data — every point in spacetime simply applies the rule.
Earth, however, is special. It sits between a 5800 K source — the Sun — and a 3 K sink — deep space. Energy pours in as high-grade photons and leaves as low-grade infrared. The free-energy gradient drives the entire game.
Photosynthesis is where physics becomes information. A photon hits a chlorophyll molecule, a proton gradient forms, glucose is built. Disorder is exported as heat; order accumulates as biomass. This is the first arrow from pure physics toward what we will later call life.
"The universe is the only program that runs itself in real time."