The fourth edition of the City and Science Biennial took place simultaneously in Barcelona and Madrid, between 18 and 23 November 2025. And it was also extended with a special edition of science programming within the framework of the Guadalajara International Book Fair, held between 29 November and 7 December 2025. 

Quantum: the invisible gears of the worldThe 4th Biennial focused its theme around quantum physics, and included free activities of all kinds: workshops, conferences, artistic installations, or film cycles designed to bring science and frontier research closer to citizens, and generate curiosity, questions and vocations. 

In total, it had 20.000 attendees. Of this number, 17.500 correspond to Barcelona (where 4.500 registered for workshops and conferences and 13.000 visitors to the artistic installations of the Born and to the Science Night on Saturday evening), and 2.300 to Madrid. 

More than 70 experts participated in this Biennial, among whom stood out names of international prestige such as Juan Ignacio Cirac, Carlo Rovelli, José Ignacio Latorre, Chris Ferrie, Olaya-Castro or Philip Ball, the brand new winner of the 7th edition of the Nat Award organized by the Museum of Natural Sciences of Barcelona and who gave the starting signal to the event, with the award ceremony in the Hivernacle of the Ciutadella Park.

Another of the events that aroused the most interest were the experiments and games, and also the round tables, especially those on geopolitics and philosophy, the latter led by Alyssa Ney, or the one that debated the role of women in science and which included the presence of scientists such as Dafna Feinholz, María Josefa Yzuel and Núria Castell. In both these cases, as in the rest of the dialogues and conferences, the public was very participatory during the question and answer period.

In addition to the central programming in El Born, interested people were also able to enjoy all kinds of activities in other spaces such as the civic center of the Convent of Sant Agustí, the Convent of Barcelona Activa, the Canòdrom, the Cinema Maldà or the Pompeu Fabra University, as well as events organized in other municipal facilities and included in the + Biennial program. 

In Madrid, the opening ceremony should also be highlighted, where an avatar of Albert Einstein participated in a conversation with María García Díaz and Carlos Sabín. This proposal was made possible thanks to the technology developed by the Q-Math research group of the Institute of Mathematical Sciences (ICMAT) and the Carlos III University. Juan Ignacio Cirac, for his part, also participated in a conversation with Marta Peirano in Madrid entitled “What is quantum optics?”. Carlo Rovelli’s conference with Blanca Pujals, also called “Quantum loops between Madrid and Barcelona”, aroused considerable interest. 

The City and Science Biennial is one of the most important scientific culture events held in the city of Barcelona, ​​which shows the firm commitment that Barcelona City Council has made to science policy. In fact, it is one of the initiatives included in the Barcelona Strategic Plan for Science and Innovation 2024-2027 with the aim of strengthening science dissemination and communication activities, to generate critical capacity, knowledge and a scientific vocation in all ages.

The first four editions have already attracted 50.000 visitors!

• Report 2025
• Participants 2025
• Consulta les activitats
• Descarrega el programa en PDF
• Dossier de premsa 4a Biennal
• Galeria de fotos
• Graphic material
• Press Clipping