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Particle physics is the study of fundamental particles, which are the smallest known building blocks of matter and radiation. It explores their properties, interactions, and roles in the formation of the universe. In this context, it fits under "Energy" as these particles carry energy and mass that can be converted into each other according to Einstein's famous equation E=mc^2. Furthermore, particle physics is a key component of understanding how energy works at the most fundamental level, making it an essential part of "Physics". Within the broader context of "Science", particle physics contributes significantly to our overall scientific understanding by providing insights into the nature and behavior of matter and energy, which are two fundamental pillars of scientific inquiry.