The bats can hang from the curly fan belt or other ceiling attachments, including a net and a smaller metal spiral. Or they can grab directly onto the poured concrete ceiling, which was texturized specially for the cave. The metal pipe and pool of water are designed to bring rainwater into the cave, both to maintain humidity levels and to provide drinking water for the bats.
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.