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Then comes another one as the assembly line continues, the sounds of sewing, stitching, cutting and soldering echoing off the high ceilings.

More often than not, organizations, educational systems, companies and other systems just want good solders who do what they're told and say nothing.

Over the past century, lead was used in paint, pipes, solder, and, most disastrously, automotive fuel.

Khalife didn’t give his name, but did reveal he was a serving solder.

The resulting flexible board withstood all sorts of electronics manufacturing processes, including cutting shapes into the boards with lasers, printing circuits on top of them with commercially used silver inks, and soldering components to them.