<ul><li>Physicists have theorized the existence of a particle that behaves differently depending on its direction of movement.</li><li>This particle, known as a semi-Dirac fermion or quasiparticle, has been observed in a semi-metal crystal.</li><li>The researchers cooled the crystal to near absolute zero, exposed it to a powerful magnetic field and infrared light to capture the signal of these unusual quasiparticles.</li><li>The discovery is consistent with Einstein's theory of Special Relativity and challenges common sense physics.</li></ul>

This Particle Only Has Mass When Moving in One Direction

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