This is enough to restore the image of jellyfish that swarm on certain coasts at the risk of spoiling bathers' holidays. Indeed, these gelatinous animals, thanks to the mucus they release under stress, "trap" nanoparticles that disperse and accumulate in the water, and which no current filtration system can retain. Filmmaker Jean-François Comminges met Philippe Barthelemy, chemist at the laboratory Nucleic Acids: Natural and Artificial Regulations (ARNA – CNRS/Inserm/UBordeaux), Alain Thierry, biologist at the Mediterranean Institute of Biodiversity and Marine and Continental Ecology (IMBE – CNRS/AMU/IRD/UAPV) and Fabien Lombard, zoologist at the Villefranche sur Mer Oceanographic Observatory (OOV -CNRS/UPMC. In a 7-minute video, they share this promising discovery with us. Suddenly going from the status of an undesirable scourge to that of a prophetic solution, the jellyfish thus continues its incredible journey through the ages and future hopes…