A handheld computing unit includes a hardware section and memory. In one implementation, an apparatus flows the aqueous mixture over a hydrophilic surface to form a first region of purified water and a second region of at least one concentrated non-aqueous component. The vehicle may include a secondary PV assembly coupled to a display unit to provide an independent indication of the intensity of solar irradiation. A spring clip of the correct size seats properly in the spring tower groove and in the lesser-diameter pin housing groove, resulting in a correct overall length of the SHVL. In another embodiment, the user can edit the set favorite channel separately. In addition, there is a small brush used to cleaning film residue from printed matter.