In his State of the Union Address, Obama promised executive action to reduce pollution and fund alternative fuel research. Got questions? We'll be at the White House later today to get answers for you. UPDATE: The Q&A is over now. Thanks for your great questions!
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.