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It is shown that classical electrodynamics in its alternative Kemmer-Duffin-Petiau-Harish-Chandra formulation surprisingly reveals a Hilbert space structure leading to the possibility of entangled states of classical radiation, and this in turn implies the violation of Einstein-Bell locality in spite of Lorentz invariance., Comment: 4 pages revtex format, no figure, Comments welcome

It is shown that both classical and quantum light can acquire a topological phase shift induced by classical gravity, and the latter is detectable in a laboratory-scale experiment., Comment: 4 pages, Revtex, one eps figure, revised to include feasible experiment; Comments welcome

We show that bipartite entanglements involving non-orthogonal states are {\it necessarily nonmaximally} entangled, however {\it small} the non-orthogonality may be. How the deviation from maximal entanglement is related to nonorthogonality is quantified by using two independent measures of entanglement corresponding to the violation of Bell's inequality and the entropy measure respectively. This result is true even if one of the subsystems has orthogonal states. An application of this is that a maximal violation of Bell's inequality in entangled neutral kaons is not possible in the presence of CP violation., Comment: 7 pages Revtex, no figures

It is shown that superluminal optical signalling is possible without violating Lorentz invariance and causality via tunneling through photonic band gaps in inhomogeneous dielectrics of a special kind., Comment: 10 pages revtex, no figure, more discussions added, submitted to Phys. Rev. E

Consciousness is the process by which one attributes `meaning' to the world. Considering F$\phi$llesdal's definition of `meaning' as the joint product of all `evidence' that is available to those who `communicate', we conclude that science can, not only reduce all the {\em evidence} to a Basic Entity (we call BE), but also can `explain' consciousness once a suitable definition for {\em communication} is found that exploits the quantum superposition principle to incorporate the fuzzyness of our experience. Consciousness may be beyond `computability', but it is not beyond `communicability'., Comment: 7 pages, Revtex, revised version of the one that appeared in the proceedings of National Conference: `Scientific and Philosophical Studies on Consciousness' edited by B. V. Sreekantan et. al, NIAS, Bangalore, India

The determination of CP violating phases in the Majorana neutrino mixing matrix using phenomenological constraints from neutrino oscillations, neutrinoless double beta decay, ($\mu^-, e^+$) conversion and few other processes is discussed. We give the expressions for the phases in terms of the mixing angles and masses consistent with the recent data from Kamiokande., Comment: revtex, 5 pages, no figures

After reviewing the general framework to study EPR-like neutrino oscillations, we derive expressions for the oscillation probabilities and a direct measure of CP violation. We compare the possibility of studying CP violation in this case with that of baseline accelerator experiments and conclude that it is possible to study CP violation in experiments with length scales comparable to that of short baseline accelerator experiments., Comment: 5 pages, latex, revtex style, no figures, more discussions are added in the revised version