A mixing system and method for forming bone cement by mixing liquid monomer methyl methacrylate with a powder component comprising polymethyl methacrylate. In a further embodiment, the garment bears an integral back pack which can be used while the garment is being worn, and can be transformed into either the pillow shape or into a wearable back pack, with the garment structure fully contained and concealed in both of these configurations. An elongated, longitudinally and downwardly extending track molded integrally with the central part of the bottom of the board fits in an annular groove around a roller on which the board is supported to pivot about a horizontal axis. Continued pulling on both the secondary and primary triggers causes a sear to fall off the primary trigger and the firearm to discharge. The content of the communication and the future location of the recipient are determined from an analysis of electronically-accessible resources by or about the sender, the recipient, or both. A display apparatus has a laminated organic electroluminescent element obtained with the manufacturing method.