In this term paper, two friends and I explored the strange behaviour of neutrinos—tiny, nearly massless particles that can change “flavour” as they travel through space. We dug into the quantum mechanics behind this phenomenon, known as neutrino oscillation, and derived the math behind how and why it happens. We also looked at the deeper symmetries in physics, like CPT and CP violation, to understand what neutrino behaviour might tell us about the universe’s fundamental laws. It was a deep dive into particle physics, and a fascinating glimpse into how much we still don’t know.