Wolfram Demonstrations Projecthttp://demonstrations.wolfram.com/An Open Resource of Interactive Mathematica VisualizationsCopyright 2009 Wolfram Demonstrations Project & ContributorsBasic Structure, Plane Orientation, and Facetting in the Face-Centered and Body-Centered Cubic Crystal Structureshttp://demonstrations.wolfram.com/BasicStructurePlaneOrientationAndFacettingInTheFaceCenteredA/]]>http://demonstrations.wolfram.com/BasicStructurePlaneOrientationAndFacettingInTheFaceCenteredA/The Sum of the Interior Angles of a Triangle Equals 180 Degrees by Paper Foldinghttp://demonstrations.wolfram.com/TheSumOfTheInteriorAnglesOfATriangleEquals180DegreesByPaperF/]]>http://demonstrations.wolfram.com/TheSumOfTheInteriorAnglesOfATriangleEquals180DegreesByPaperF/