Classical physics states that everything that happened in the past can be exactly know and everything in the future can be exactly predicted, provided you know the position and momentum of every single particle in the universe. Sure that's an absurd demand, a single droplet of water has number of particles of the order 10^23 which is incomprehensibly huge to just think about let alone measure. A small water droplet has more molecules than the number of grains of sand on earth! But philosophical consequences of determinism in classical physics do not concern with practicality. The fact that once things are set in motion, everything from the time universe was born, stars forming and exploding, dinosaurs going extinct, what you'll eat for breakfast tomorrow or do anything for that matter- can be exactly calculated using Newton's laws of motion. From Big bang to Breakfast, everything can be in-principle predicted exactly in classical physics. [Image by GPT 5.2] A deterministic...