Daghlian was working alone when he accidentally dropped a block of tungsten onto the plutonium core, which increased the reflection of neutrons and pushed the system into a supercritical state.
The incident at Three Mile Island heralded a dramatic shift in public attitudes towards nuclear power and the second reactor never returned to service.
Marie and Pierre Curie proved the existence of the new element radium when they chemically isolated one-tenth of a gram of pure radium chloride.
28th June 2015
11th November 2025
11th November 2025
1st September 2018
9th November 2019
