The present invention discloses a method and apparatus for the directed formation of a re-entrant micro-jet formed upon the collapse of a working cavitation bubble formed proximate to a work surface. Because the spraying device comprises a catalyst for the conversion of the gases contained in the water, the gases released from the water during the spray degasification can be removed easily, reliably and completely. The level shifter receive an input signal and outputs a logically equivalent output signal with higher voltage, wherein the voltage of the output signal is between the voltages of the first voltage terminal and the second voltage terminal. The system identifies ones of the issued other queries as similar to the first query based on the comparison. Each of the at least two substantially unprocessed physiological data signals are associated with different patients. In a first preferred embodiment, each player receives six pieces arranged in two stacks of differentially sized and nested pieces, three pieces to a stack.