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The systematic study of phenomena across the four dimensions of spacetime—length, width, height, and time. Unlike 3D sciences, which treat time as a separate parameter, 4D sciences integrate time as a full dimension, meaning objects are understood as four-dimensional "worldlines" extending from birth to death. A person isn't a 3D object that changes over time; they're a 4D object—a spacetime worm—with their infant self connected to their adult self connected to their future corpse. 4D sciences explain why you can never step in the same river twice (the river's 4D shape is different), why your past self feels like a stranger (they're just far away in the time dimension), and why you should be nice to your future self (they're literally the same 4D object).
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