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""Sieve Stack" Reflections on a stack of round powder sieves used to separate powdered metal into size fractions. Ames Laboratory uses these in their research on powder metallurgy. It's almost guaranteed that you have some lead free solder in your phone, or other electronics you own, that is based on ISU/Ames Lab patented technology and most likely was fed into the manufacturing process as a powdered metal." by Trevor Riedemann
via ISU Photostream

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