I’m a physicist. Quantum Electrodynamics explains the motions of electrons really well. Extreme precision has been found. As we move towards molecules in chemistry, things are difficult to predict. Then comes large molecules of carbon chemistry, organs, physiology, humans, psychology. Well things go unpredictable at levels of large carbon based molecules. Solutions to Schrodinger’s equation exist for such systems. They’re just unrealistically difficult to predict. We can just make estimates. These sciences of organs, physiology, humans, psychology, aren’t exact sciences. We can just fill in few patterns and we’d find explanations. Science is awesome my friend! It more than explains many things!