Quantum physics, often perceived as an abstract theory far removed from everyday life, has been one of the most transformative forces of the contemporary world. Since the beginning of the 20th century, this discipline has changed the way we understand reality and has made possible advances such as computers, the internet, and mobile phones. Now, as its application expands into fields such as artificial intelligence and secure communications, quantum physics is once again at the center of scientific and social debate. In this context, Barcelona will host the fourth edition of the City and Science Biennial from November 18 to 23, coinciding this year with the International Year of Quantum Science and Technology. For six days, the Biennial will offer more than 130 activities—80 of them in Barcelona—to bring this scientific revolution closer to the public. The program will take place simultaneously in Barcelona and Madrid, and for the first time will extend to Mexico, within the framework of the Guadalajara International Book Fair (FIL), where Barcelona will be the guest city.

The phone that wakes us up, the microwave that heats our milk, or the MRI that we undergo in the hospital. From the moment we wake up until we go to sleep, quantum physics accompanies and influences us. In fact, the impact of this discipline—often shrouded in mysticism—has also changed the way we understand the world and geopolitics. And the world of culture and the humanities is no stranger to this revolution, as the journal seeks to demonstrate. fourth edition of the City and Science Biennial, which will be held simultaneously in Barcelona and Madrid from November 18th to 23rd, co-organized by the Círculo de Bellas Artes. This year, there will be a special program to mark the Guadalajara International Book Fair, of which Barcelona is the guest city, from November 29th to December 7th.

Today, getting around without Google Maps is unthinkable for many people, as if it were a fifth limb without which we can't go anywhere. The emergence of GPS already had a huge impact and changed the way people do things, as did other inventions such as lasers and transistors. All of these technologies are part of the first quantum revolution, which transformed the world at the beginning of the 20th century. Later, a second quantum revolution took place with quantum computing, communications, and sensors, which reconfigured the economic system and the way we organize ourselves, just as their predecessors did. Therefore, the fourth edition of the City and Science Biennial, which will be held simultaneously in Barcelona, ​​Madrid, and Mexico City from November 18 to 23, aims to rethink these technologies with an eye to the future and address the main scientific challenges of the moment.