The Unabomber’s evolution was chilling. His early bombs, crude concoctions of smokeless powder and match heads, were child’s play compared to this. The device that maimed Hauser was a three-quarter-inch-diameter pipe, sealed with metal bar stock plugs and secured with pins. Nail fragments, lead, and double-pointed tacks served as shrapnel, designed to maximize suffering. Six D-cell batteries, their casings stripped, powered a metal and wooden initiator inside the pipe, triggered by an improvised loop switch. The plastic file box was reinforced with a wooden frame, a testament to the bomber’s growing obsession with perfection.

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