Methods and systems for determining coordinates for an area of interest on a specimen are provided. The processor receives at least one search parameter. A second propeller assembly mechanically linked to the first propeller assembly may be mounted to rotate in a second direction about the longitudinal axis of the doll body and is positioned below the first propeller assembly. Because the ironing board must be pulled up to be used, no one is injured when the ironing board is disengaged from its stored position. Also provided is a method to cryopreserve Mustelidae embryos or cells, and to enhance the number of live offspring from cryopreserved Mustelidae embryos. The plurality of blades has a uniform airfoil-shaped cross section, where the airfoil cross section presents a non-zero angle of attack to the current.