sentences:  Centauri females mostly or entirely shave their heads.The social significance (if any) of complete versus almost-complete baldness on a female is not specified outright; however, in the televised episodes, older females are shown completely bald, and younger (up to the apparent human age range of the 30s, and often but not always unmarried) with ponytails.The cardio-vascular system of Centauri includes two hearts instead of the single heart that humans have.