A new pilot study shows that microplastics — plastic particles that are smaller than five millimeters or close to the size of a short rice grain – can be found in human testis and semen, according to the paper published last month inScience of The Total Environment. While experts believe more data are needed to confirm the findings, this study sheds light on the possible penetration of microplastics into the human reproductive system and the urgency for understanding their potential health impact.