¿Por Qué los Hombres Aún Tienen Barba Si los Humanos Perdieron Todo su Pelaje?

Why did men retain beards when humans lost all their body hair? Discover the evolutionary mystery behind male facial hair. We explore thermoregulation, Darwin's sexual selection, and the fascinating hypothesis of pugilism as a biological shield. Subscribe to the channel! Sources and Scientific Studies Mentioned in this Video: Dr. Nina Jablonski: Anthropological research on the evolution of human skin, thermoregulation, and the development of sweat glands for persistence hunting. Charles Darwin: The Descent of Man, and Selection in Relation to Sex (1871) – Foundations of the theory of sexual selection and traits not linked to thermal survival. Dr. Barnaby Dixson: Evolutionary psychology studies on how facial hair alters human perceptions of dominance, maturity, aggression, and social status. David Carrier and Michael H. Morgan (University of Utah): Biomechanical research on the "pugilism hypothesis", demonstrating in the laboratory that hair follicles absorb and dissipate the kinetic energy of blunt impacts.