A system for controlling outdoor signs has an outdoor sign having a price that is controllable. A method for destroying cancer cells in blood includes circulating blood from a patient through a vessel coupled with a sound energy source and exposing the blood, when passing through the vessel, to sound energy at a resonant sweep frequency to make cancer cells therein act as cavitation nuclei and implode without implosion of other cells not resonant with the resonant sweep frequency. The main head is embodied with first channels and the nozzle body is embodied with second channels which are flow-connected to the first channels. 5-4-2-ethoxy-7-benzothiophenylmethyl-2,4-thiazolidinedione and the corresponding sodium salt which are from agents useful in the treatment of diabetes. The client sends a refresh request and receives a refresh response from a server.