This ingenious piece of hardware threads into a tree and it serves as a mounting point in the construction of tree structures. In short, these fasteners are your first stop in building one sweet treehouse. They’re super expensive, but they were designed to hold a bed-and-breakfast in the trees—no joke.
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.