There’s one grave in Arlington National Cemetery you can’t dig up — because it’s still radioactive. The story belongs to Richard Leroy McKinley, a young soldier who died in America’s first and only fatal nuclear reactor accident, the SL-1 explosion in Idaho, 1961. After the blast released 20,000 megawatts of deadly energy, McKinley’s body became so radioactive it had to be buried in a lead- and steel-sealed coffin, deep under concrete. Today, his grave — Section 31, Plot 472 — remains the only r
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