There seems to be a HALO of mysterious invisible material engulfing galaxies, which is commonly referred to as Dark matter. Scientists infer the existence of dark (=invisible!!!) matter from the observation of its gravitational pull, which causes the stars in the outer regions of a...

  National Entrance Screening Test (NEST) is a compulsory test for students seeking admission to National Institute of Science Education and Research (NISER), Bhubaneswar and University of Mumbai - Department of Atomic Energy Centre for Excellence in Basic Sciences (UM-DAE CBS), Mumbai. Both NISER and UM-DAE...

    Mathematics deals with situations in everyday life . The situations are, however, varied in nature. We come across instances of unknown or variable quantities in the course of the day. For example, when we travel in a bus, the speed of the bus keeps on changing;...