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Satyendra Nath Bose's attempt to describe the quantum statistical aspects oflight consistently in terms of particles, and Einstein's generalisation, leadto the concept of Bosons as a class of quanta obeying `Bose-Einsteinstatistics'. Their identity as a class came in sharp contrast when the Pauliexclusion principle and the Dirac equation revealed the other class calledFermions, obeying `Fermi-Dirac statistics'. Spin, and spin alone, is thedetermining factor of the multiparticle behaviour of fundamental quanta. Thisis the basis of the Spin-Statistics Connection. While it is known that theoverall theoretical picture is consistent, the physical reason for theconnection is unknown. Further, the class difference is sensitive only to thetotal spin in a quantum aggregate, as spectacularly seen in superconductivityand superfluidity, and in the Bose-Einstein condensation of neutral atomic gas.Can we grasp the true reason behind the difference in the collective behaviourof Bosons and Fermions? An explorer's journey demanding logical and physicalconsistency of what we already know takes us to the hidden factors in therelation between spin and the statistics of quanta. The surprising answer is inthe domain of gravity, that too, on a cosmic scale.

Bosons, Fermions, Spin, Gravity, and the Spin-Statistics Connection