How do you build the world’s lightest metal? Make it mainly from air ... hair — meaning that the material is 99.99 percent air. The structure is built using an innovative additive ...

Suppose that you had to build a tiny spring, antenna or other structure for use in a microelectronic ... It allows people to essentially draw minuscule metal items in mid-air.

the machine can print metal right into thin air. The oxide skin on the printed material is only a nanometer or so thick and therefore the structures remain conductive in the completed state.