The Manhattan Project that built the atomic bomb wasn't without its own dangers. Experiments on a so-called "demon core" of plutonium caused the deaths of two Manhattan Project physicists. Both ...

Harry Daghlian, a 24-year-old physicist at Los Alamos, was performing a procedure intended to make the core close to criticality without actually starting the chain reaction.

24-year-old Harry Daghlian was irradiated as a result of a criticality accident that occurred when he dropped a tungsten carbide brick onto a 6.2 kg plutonium–gallium alloy bomb core. This core, ...

The Manhattan Project was the infamous research and development proposal undertaken by the US, the UK and Canada at the Los Alamos Laboratory to develop nuclear weapons. Engineers under the direction ...