Not sure if you saw the sibling comment but in case you haven't: > Enrico Fermi himself had warned Slotin that he would be “dead within a year” if he continued

Not sure if you saw the sibling comment but in case you haven't: > Enrico Fermi himself had warned Slotin that he would be “dead within a year” if he continued (the way he was working) Some risks were absolutely known.