Microplastics are in human testicles. It’s still not clear how they got there.

No human organ is safe from microplastic contamination, it seems — not even the testicles. 

Researchers at the University of Mexico recently tested 70 samples of testicular tissue — 47 from dogs and 23 from humans — and found microplastics in every single one. The attention-grabbing study, published last week in the journal Toxicological Sciences, highlights microplastics’ “pervasive presence” in male reproductive systems, and their potential consequences on male fertility. 

The...