Starting at $34.50
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This pillow makes a perfect gift for your teen, science lover, best friend, child, and more! Choose from many different colors, two different sizes, 3 different fabrics, and if you'd like a zipper or not.
Selenium rarely occurs in its elemental state or as pure ore compounds in the Earth's crust. Minerals that are pure selenide or selenate compounds are known but rare. The chief commercial uses for selenium today are glassmaking and pigments. Selenium is a semiconductor and is used in photocells. Although trace amounts of selenium are necessary for cellular function in many animals, including humans, both elemental selenium and selenium salts are toxic in even small doses, causing selenosis.
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