Plastic pollution is everywhere—including where you would least expect it, especially when it’s in tiny particle form. Today, scientists are working to measure the consequences of this contamination. There’s the pollution you can see—on the beach, on the roadside and in open-air landfills. And then there’s the pollution you can’t—on the peak of Mount Everest, deep inside the Mariana Trench, in clouds, in buildings, and in our water supply, food, blood and brain.