Scientists first found microplastics, those tiny pieces of plastic smaller than 5 millimeters, on British beaches in 2004. In the 20 years since, the world has watched on in horror as microplastics began turning up in virtually every nook and cranny on the planet.
It seems that nobody—and no body part—is safe from microplastics. In a recent study, researchers found traces of plastic in the testicles of both dogs and humans. The potential health impacts of this discovery are not yet clear, but the team suggests it may help explain why men’s sperm counts have declined over time.
