Today I slept in till 7am and then finished my homework before going to Mineralogy.  At Mineralogy I learned about the reasons why minerals have such complex chemical compositions.  It turns out that atoms and molecules of similar sizes can fill similar areas in a minerals chemical composition.  Then in Differential Equations the sub elaborated on more ways to use the Laplace principle. Next I spent a couple hours sorting shells in the lab before going home.  Now I will study in peace.