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Kidney transplantation subspeciatisty? I have 36 purple stones. Under florescent lights stones turned violet/bluish on a 1921 Liberty $20 gold piece, what r they? Calculate stress and strain in round bar 12mm in diameter and 150mm long with tensile force of 400N acting on it? What should be added to equation to make it a perfect square 9x^4 + 2x^2 + 25? ....Please!? What is the nuclear decay equation for Carbon-14? #Chemistry?