By the late 1940s, mathematical problems with the description of quantum fields were finally resolved, and the theory known as quantum electrodynamics (QED) was completed. To this day, it is regarded as the most accurate theory in all of science. It is also the physical theory that explains at a fundamental level almost everything in the world around us, since it underpins all of chemistry and the nature of matter—from the way the electronic circuitry and microchips in my laptop work to the neurons firing in my brain, commanding my fingers to move across the keyboard. This is because QED is at
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