These microscopic robots swim through the ocean and dissolve microplastics

Good News Notes: “Microplastics—tiny pieces of plastic smaller than five millimeters across—are everywhere, from snow in the Arctic and rain in the Rocky Mountains to bottled water and beer. On the ocean floor, there may be nearly 16 million metric tons of it. In the top 200 meters of the Atlantic Ocean, there may be 21 million more metric…