Scrap metal gets a second life (and a chance to become art, robots and vehicles) at The Crucible, a nonprofit housed in a sprawling 56,000-square-foot Oakland, California warehouse where salvaged materials are used for a constant stream of classes for kids and adults in neon, jewelrymaking, glasswork, kinetics, blacksmithing, enameling and more. Local industries donate scrap of all kinds along with still-usable machinery and computers. Discarded bottles and windowglass are used in The Crucible’s glasswork classes. Discarded electronics are used in kinetics and robotics classes. An entire garage is stocked with salvaged bikes and bike parts. The warehouse is studded with scrap-metal sculptures, spiral staircases and fixtures whose components would otherwise have ended up at landfills.