Cadmium
From Tardis Wiki, the free Doctor Who reference
Cadmium was an element present on the planet Ribos, as the Magellanic Mining Conglomerate discovered in their geological survey of the planet. (TV: The Ribos Operation)
In the early 21st century, rain water had tiny but measurable amounts of cadmium, dioxin, lead and plutonium due to high pollution levels. (PROSE: Cat's Cradle: Warhead)
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