title: [Time's arrow and symmetry in Nature].
mesh_terms: D000818:Animals; D055580:Astronomical Phenomena; D001256:Astronomy; D001695:Biology; D055598:Chemical Phenomena; D002621:Chemistry; D006801:Humans; D008433:Mathematics; D055585:Physical Phenomena; D010825:Physics; D013816:Thermodynamics; D013995:Time
vernacular_title: La flecha del tiempo y la simetriá en la naturaleza.