A grout float, including a blade and a pair of core sections defining a handle. An access unit accesses a memory. By measuring the two periodic patterns with an incident beam having a single polarization state and detecting the intensity of the resulting polarized light, it can be determined if the two elements are aligned. Each of the rocker arms has a locking projection that extends radially inwardly aligned with one of the lateral openings of the base. If no other endpoints across the network happen to be viewing a particular endpoint’s video stream, the stream is not provided to the network, thus conserving network bandwidth. Methods of inhibiting the expression of human protein serinethreonine phosphatases using oligonucleotides of the invention are also provided.