The nature works in the symmetric {Hermitian of real time t, anti-Hermitian of imaginary time it} quantum physics that, respectively, unfolds into the {observed normal matter and energy, unobserved dark matter and energy}. This paper explores the symmetric physics with its prognostications and predictions in full agreements with the experimental observations that conflict with the prevalent understanding. The new physics explains, among many others, the big-bang mechanism that has long been considered to be the Creator's secret feat ever beyond human comprehension.