When you switch on your smartphone, you are probably not aware of all the minerals that have been dug up around the world to make the electronics work. An iPhone screen has been polished with lanthanum and cerium, a magnet inside is made with neodymium and praseodymium, the circuitry in semiconductors uses arsenic metals, rechargeable batteries depend on cadmium, and light bulbs and heating elements rely on tungsten. It turns out that these so-called “rare earth” minerals are essential for modern life and are used in products ranging from smartphones to MRI machines to advanced defense technology to hair dryers.
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