It is not that far back in time when we were trying tirelessly to join two magnets that were repelling each other. The question was born irremediably: how does it work? Do your children love science or are they ready to do any scientific experiment? Take them to see the new exhibition at the Palais de la découverte: "Magnetics" or how to know everything about magnetism. Where to find magnetism? How to explain it? What is it used for? Today, the Palais de la découverte invites us to understand how magnetism works in an interactive exhibition for young and old. We discover the origins of magnetism, its elementary properties and how to explain it. Then, the exhibition shows us the daily uses of magnetism, and then reflects on its central place in the functioning of a computer. Finally, a research laboratory leads us to the discovery of working instruments, used to manufacture materials with new magnetic properties. About sixty experiments during these five stages invite you to discover the properties of magnetism and its usefulness. Nothing magical about all this: magnetism is science, come and experience it for yourself!