Let's talk about arsenic. Yup, it's poisonous but combined with gallium, it gives us present day solar panels!
With lead, we get car batteries. With groundwater, it becomes a worldwide problem. When heated, it smells like garlic.
Because it is so poisonous, China is the top producer of this material. It has been used in chemical weapons, insecticides, alloys, and even in treating cancer.
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