Mood modifiers have been used from time immemorial — caffeine, alcohol, nicotine, immune system enhancement, vision enhancement, anesthetics — we take that very much for granted, but just think about how great progress that is — like, having an operation before anesthetics was not fun.
Se han usado modificadores del ánimo desde tiempos inmemoriales — cafeína, alcohol, nicotina, reforzadores del sistema inmune, reforzadores de la vista, anestecias. Damos a esas cosas por hecho, pero sólo piensa cuan gran progreso eso es — por ejemplo, tener una operacion antes de la anestecia no era divertido.