After the wild success of Manhattan's High Line park, more ideas of how to use New York City's noble, unused or decrepit spaces have popped up. This is one of our favorites: beneath the Lower East Side lies an unused trolley station, which Dan Barasch and James Ramsey propose could be the site of a completely crazy futuristic underground park. Read more at Treehugger.
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.