CosmoCaixa (Science Museum) as many guided tours organized, some of them are included in the ticket and they provide a lot of explanation about the expositions in the museum – It is recommended to join them. The tours are available in Spanish, in Catalan and in English (for additional information – Attractions and Tours in Barcelona).
CosmoCaixa is offering deals with few cards, such as Barcelona Card, Barcelona Pass or Barcelona Card Express. Using these cards one can get a discount or even enter free of charge to the science museum and other places included in the cards. Therefore, it is suggested that before you buy your tickets check which one of them is suitable for you (for additional information – Barcelona for Free).