Microplastics and nanoplastics are found everywhere on Earth, from the depths of the oceans to agricultural soils to the inside of the human body. Scientists are still trying to understand what these particles do after entering living organisms. A new study suggests an innovative strategy based on fluorescence. This method will allow researchers to track microplastics in real time. Their movement, transformation and degradation inside biological systems will be observed. The strategy will thus help to better understand the impact of microplastics in the body.