Arlington resident Michael Walsh has been named one of this year’s 25 MacArthur Foundation “geniuses.” Walsh, who’s 62, is a technical consultant and vehicle emissions specialist who works to reduct the effect of internal combustion engines in order to improve the environment. A Google search shows that he also previously won the Dr. Arie Haagen Smit Clean Air Award from the California Air Resources Board. Walsh gets $500,000 over the next five years. Good for him!