Climbable tubes made of wrought-iron netting wrap around two aircraft fuselages, a fire engine, a castle turret, three tram cars and a 25-foot-tall cupola in this adjunct to the St. Louis City Museum. Iron “slinkies” narrow and spill out onto a three-story slide. Designed by Bob Cassilly.
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.