According to one embodiment, target tracking device includes passive processor, active processor, fusion unit and correction unit. The apparatus employs a grooved ring to divide the fluid stream and impart a high velocity on each of the divided or sub-streams. The framework is configured to prevent a baseball from contacting the face of the player when the guard is donned by the player without restricting the player’s generally horizontal line of sight. leukemia and lymphoma cells, which may include screening assays directed at \u03b2-catenin, or members of the \u03b2-catenin signaling pathway. Each of the alternate video content segment encodings may include a respective digital watermark. One apparatus includes a container that is configured to hold froth therein and change at least a portion of the froth into substantially separate liquid and gas portions when an electrostatic charge is discharged through at least a portion of the froth between at least two electrodes at least partially arranged within the container.