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The study of physical laws as they operate across the four dimensions of spacetime, treating time not as a separate parameter but as a full [coordinate] alongside space. In 4D physics, objects are [understood] as four-dimensional worldlines—complete trajectories through spacetime from beginning to [end]. A person isn't a 3D object that moves through time; they're a 4D object—a spacetime worm—with their entire existence laid out like a path. 4D physics explains why time seems to flow (we're just moving along our worldline), why the past feels fixed (it's just the part of the worm behind us), and why you should have paid attention in [relativity] class (because your GPS needs 4D corrections to work). It's the physics of block universes, where past, present, and future all coexist, and your sense of "now" is just a local illusion.
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