Indeed, like many notions in today’s science, it appears to violate common sense. That seems like a radical idea, even to many physicists. We will explain Feynman’s approach in detail, and employ it to explore the idea that the universe itself has no single history, nor even an independent existence.But quantum and classical physics are based on very different conceptions of physical reality. Quantum theories have turned out to be remarkably accurate at predicting events on those scales, while also reproducing the predictions of the old classical theories when applied to the macroscopic world of daily life. Instead it was necessary to adopt a different framework, called quantum physics. Although that account is successful enough for everyday purposes, it was found in the 1920s that this “classical” picture could not account for the seemingly bizarre behavior observed on the atomic and subatomic scales of existence. We can specify their precise position at each moment in time. According to the traditional conception of the universe, objects move on well-defined paths and have definite histories.
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