Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. War is friction, sometimes literally. When the wear and tear of use ...
Rocket engineering is shifting from painstaking machining and welding to a world where engines and tanks emerge from printers ...
SCHOFIELD BARRACKS, Hawaii—A propeller blade that would take 18 months to replace. Parts for an expandable office that would cost hundreds of dollars to buy. A howitzer bracket that is unavailable at ...