The book , 'Special Relativity With Einstein' 2015, particularly explains; Universal non-constancy of speed of light and, of 'c'. but, it is 'ct'. The space contraction and time dilation in Special Relativity are apparent; not real. Excited orbital electron has linear speed 'c'. Speeds greater than 'c' are existed. Mass is Eternal Quantity forever. Light Mass Particles, the very basic photons, when stationed in space, are dark/black photons forming the 68 % of the total Universal energy. The First Universe birth have taken place through 'whirling' of 'Dark Energy Matter'. This book gives physical characteristics of a original basic photon and its process of release from excited orbital electron of its host atom in detail. The book reveals more properties of Relativistic Mathematics.