Those of you who are familiar with Arthur C. Clarke's 1955 novel Earthlight may recognize a new weapon from DARPA dubbed the Magneto Hydrodynamic Explosive Munition (MAHEM). In the novel, a commander unleashes "The Stiletto"—a weapon consisting of a jet of molten metal hurled through space by an electro-magnet. The MAHEM concept works in much the same way, using a magnetic field to propel a chunk of molten metal that will morph into an aerodynamic slug in flight.
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