A pet leash and a method of making and using same. The FET may be formed as a gate electrode of a p-channel type field effect transistor, and a gate electrode of a n-channel type field effect transistor on the silicon layer which has the strain effect through a gate insulating film. These methods can be used to treat a variety of cancers and other diseases and conditions. The message specifies one of the sub-elements of the data object to be updated and includes a new value of that sub-element but does not include a new value of the entire data object. Preferably, the pit is recessed into a ground surface, and an upper surface of the first platform is substantially flush with the ground surface when in the lowered position. The sensor can measure the hydrocarbon content in the flow of gas in the purge line from a hydrocarbon storage device to an internal combustion engine.