Microplastic pollution has been detected in every sample of human testicles tested in a new study, potentially contributing to declining sperm counts in men. The study, conducted by researchers at the University of New Mexico, found that microplastics may lodge in human tissues and cause inflammation or release harmful chemicals. The researchers noted that microplastics are ubiquitous, found from Mount Everest’s peak to the ocean’s depths, and people ingest and inhale these particles daily. This highlights the need for further research to understand the health impacts of microplastic pollution.