Mobile communications devices output advertisements such as by visually displaying them in accordance with an advertisement recipe. Various methods and apparatus described herein may facilitate downhole testing. Moreover, a removable extension segment is preferably provided so as to increase an overall length of the lancet device as desired by a user. Each read operation is delegated to each of its respective plurality of media servers until one of the respective plurality of media servers is available. Thus, it is possible to reduce the time required to calculate the optimal weight by means of the optimization algorithm. The second layer can be spaced apart from the first layer and can include a multiple number of optical waveguides.