There are mainly two types of particles in particle physics. These are bosons and fermions. Both of them have sub - categories of particles. A fermion is a particle that has odd half-integer spin, for example, like12, 32and so on. Quarks, Leptons, Protons, Neutrons are fermions. Bosons are those particles that have integer spin like 0, 1, 2 and so on. For example, Bosons are like Photons, Gluons, W+, W−, Z0 bosons, Higgs bosons, Mesons etc. All matter particles (that have mass) are fermions and they have significant mass. All force carrying particles are bosons. In this paper, I will show that space-time interacts and get reversed with fermions only. Bosons interact but do not get reversed in space-time. More specifically, space-time gets reversed for anti-particles (fermions) but space-time is identical for bosons. Thus, all matter particles have their counterpart anti-particles but all force carrying particles do not have their counterpart anti-particles.

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