Now let’s talk about the drama queens of pollution: lead, mercury, and cadmium. These metals are not welcome at any party. Mercury, in particular, is a troublemaker: it bioaccumulates in fish, which means a tuna can contain more mercury than a broken thermometer. How? It starts from coal power plants, falls into the ocean, gets eaten by plankton, then by small fish, then by bigger fish, and finally lands on your sushi platter.
Fun fact: The FDA recommends pregnant women avoid certain fish not because of the fish’s personality, but because of metal. Mercury can mess with your nervous system, causing tremors, memory loss, and the sudden urge to quote Shakespeare incorrectly. Avoid that.
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But not all metals are bad. Iron and zinc are essential in tiny amounts—they keep your blood happy and your immune system awake. The problem is dosage, like almost everything fun in life. A river with too much iron turns rust red, which looks dramatic but is basically nature’s way of saying, “I’m bleeding construction equipment.”
