When fish like this netted cod are exposed to mercury, it accumulates in certain organs, including the lenses of their eyes. Yvette Heimbrand, CC BY-ND Humans, animals and birds are exposed to ...

When I was little, I learned to swim by diving for coins in the pool. It wasn’t easy seeing the coins underwater. It was blurry down there. I talked about how fish see with my friend Nora Hickey.

Mercury pollution is a global threat to human health, especially unborn babies and young children. Exposure to methylmercury, a type that forms when mercury washes into lakes and streams, can harm ...