According to one embodiment of the present invention, a device may receive one of multiple frequencies at a clock input of the device; determine which of the multiple frequencies is received; and generate at least one internal clock frequency for operation of the device using the received frequency. A leaf spring includes a first end engaging the housing and a second end biasing the back support and seat support in an upward direction. Each message in the first column can have an associated indicator for indicating a quantity of predecessors and successors to the set of messages, as well as an in-line reply button for replying to the set of messages. The rotated and fixed magnets repel each other. The present invention also provides a method of synthesizing a hydrogel comprising poly cross-linked hyaluronic acid, which comprises synthesizing methacrylated hyaluronic acid; and copolymerizing methacrylated hyaluronic acid with N-isopropylacrylamide. In providing a toggle and a toggle connection, with which high axial forces can be transmitted while, at the same time, maintaining high angular mobility of the pans and troughs, shoulder areas of the toggle are designed so as to be spherical.