This volume gathers two plays inspired by scientific subjects, “The Expression of Emotions” (2014) and “LED – Inner voyage in a Computer” (2006), both written and directed by Mário Montenegro. In both cases we are faced with a kind of writing that experiments and opens paths in the dialogue between art and science, in the first case, speculating on the classification of human emotions, which began to be rehearsed by physiologists and naturalists of the 19th century; in the second case, summoning the inner functioning of a digital computer, a machine that appeared in the 20th century and redefined the frontiers of human experience. The process of creation involved the collaboration between researchers and artists, confirming the special place that both Mário Montenegro and Marionet occupy in Portugal in this context of science theatre.