The 4th Joint Symposium on Nanotechnology, organized by the German Federal Institute for Risk Assessment (BfR) and the Fraunhofer Network Nanotechnology (FNT), was held May 30-31, 2022. The conference included presentations on topics such as the use of nanotechnology in textiles and packaging, its application in agriculture, the introduction of nanomaterials into the body, and future-oriented assessment approaches. The following presentations from the conference have been posted online....