Slotin's story is such a great example of complacency. "Using a screwdriver was not a normal part of the experimental protocol. ... the screwdriver slipped and

Slotin's story is such a great example of complacency. "Using a screwdriver was not a normal part of the experimental protocol. ... the screwdriver slipped and the upper beryllium hemisphere fell, causing a prompt critical reaction and a burst of hard radiation."