 Freeman Dyson, group leader on the project, estimated back in the 1960s that with conventional nuclear weapons each launch would statistically cause on average between 0.1 and 1 fatal cancers from the fallout.That estimate is based on no threshold model assumptions, a method often used in estimates of statistical deaths from other industrial activities.Each few million dollars of efficiency indirectly gained or lost in the world economy may statistically average lives saved or lost, in terms of opportunity gains versus costs.