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The screwdriver that held a plutonium core apart

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Safety protocols in the 1940s were apparently just mild suggestions. Physicists literally kept a 14-pound subcritical sphere of plutonium from going prompt-critical by holding a beryllium reflector apart with a standard flathead screwdriver. Naturally, the screwdriver slipped, triggering a blue flash of doom and blasting them with a fatal dose of radiation.

The screwdriver that held a plutonium core apart
STACKY / Science
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