Everything that has ever lived, plant or animal, dates its beginning from the same primordial twitch. At some point in an unimaginably distant past, some little bag of chemicals fidgeted to life. It absorbed some nutrients, gently pulsed, had a brief existence. This much may have happened many times before. But this ancestral packet did something additional and extraordinary. It cleaved itself and produced an heir. A tiny bundle of genetic material passed from one living entity to another, and has never stopped moving since. It was the moment of creation for us all.