Are papers presented in corpus-based translation studies truly scientific? These are normally done on only one language pair, often on purpose-made parallel corpora, and can normally not be replicated. Therefore their value is limited in a strictly scientific sense. The use of comparable parallel corpora allows both for the replication of studies, and the testing of complex hypotheses like Halverson’s Gravitational Pull hypothesis. This chapter defines and discusses the concept of comparable parallel corpora, and exemplifies their value by illustrating their use. The chapter also presents hopes for the future, as new groundbreaking technology that will allow the linguist to create her own parallel corpora without the aid of computer scientists is currently being launched at the University of León in Spain.