A child vehicle seat includes a seat assembly including an upright portion having a first passage and a second passage defined therein. An exemplary apparatus is a miniature pump that includes a shape memory wire that obtains a plastic condition below a transformation temperature and has a memorized shape such that the shape memory wire produces a work stroke by returning to the memorize shape at least at the transformation temperature. The net bodies are disposed in a cylindrical flow passage at intervals of 5 to 200 mm, and the number of the net bodies is more than 50 and 200 or less. In other aspects, methods of virtual \u201cface lifts\u201d and methods of detecting faces within digital image are provided.