Have a question on our nation's infrastructure related to the environment, energy industry, transportation systems, and utilities industries? Send them to @AiiNonProfit on Twitter or e-mail them to info@aii.org. Go to Aii.org/Ask-Aii for more! Ask the Expert is a video cast provided by the Alliance for Innovation and Infrastructure (Aii), an independent, non-profit alliance focusing on infrastructure innovation through awareness and education. more