Part 4/9:
Einstein's skeptical response highlights his struggle with this concept. He considers it illogical, arguing that it threatens the very principles of determinism that had long underpinned classical physics. To him, the idea that a particle does not exist until it is observed is a reduction of reality to mere observation, a notion that he finds particularly perplexing. His stance is clear: he believes that the rules governing the observable world should also apply to the invisible realm of subatomic particles.