The ridges on your fingertips were set before you were born, and well before anyone had decided what to call you. By around the thirteenth week of pregnancy the pattern that will identify you for the rest of your life is already being laid down on the pads of the developing fingers. It is one [...] The post Your fingerprints begin forming before birth, shaped by genetics and the precise local conditions of those few weeks in the womb — which means one of the most personal marks on your body was