Jeremiah Cornelius writes: The US Navy's new railgun technology, developed by General Atomics, uses Lorentz force in a type of linear, electric motor to hurl a 23-pound projectile at speeds exceeding Mach 7 — excess 5000 MpH. The weapon has a range of 100 miles and doesn’t require explosive warheads. "The electromagnetic railgun represents an incredible new offensive capability for the U.S. Navy," says Rear Adm. Bryant Fuller, the Navy’s chief engineer. "This capability will allow us to effectively counter a wide range of threats at a relatively low cost, while keeping our ships and sailors safer by removing the need to carry as many high-explosive weapons." Sea trials begin aboard an experimental Navy catamaran, the USNS Millinocket, in 2016.