Quote from: liudr on Apr 15, 2012, 02:39 amBesides different in density, are they different in any other ways, such as color, conductivity, magnetic property?Do you have to involve arduino in this project to show some competence or are you finding solution to a problem you encounter and think arduino could help?If I calculated correctly, the nylon ball has a density of 1.1g/cm^3 and the other is b