OnScreen Science today announced the availability of OnScreen DNA, its interactive 3D visualization software designed to place understanding of the structure and workings of DNA within easy reach of Macintosh users. While aimed primarily at high school and college biology teachers for use in classes or computer labs, OnScreen DNA should benefit others with an interest in this fundamental topic of modern biology, notes the company. OnScreen DNA requires Mac OS X 10.3.9 or later, priced at US$199. A free demo is available.