As always, leave a comment here to win this illustration on a T-shirt--we'll pick someone at random. And if you've won a shirt over the last few weeks and haven't received yet, hang tight, it's on its way.
Have a good iPad/Easter weekend everyone!
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.