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This Particle Only Has Mass When Moving in One Direction

physics is not everyone’s cup of tea. A team of physicists have theorised the existence of a strange type of particle that behaves differently depending on its direction of travel—massless in one direction but possessing mass when moving the other way! This strange, elusive particle, known as a semi-Dirac fermion or "quasiparticle," has actually been observed in action.

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