Some day in the future,we will have the Anti Matter bomb which will be the deadliest weapon ever, that is if we manage to avoid destroying ourselves with nukes and any other powerful weapons we'd make along the way. as of right now, nuke . I'm not saying the human mind since it's where weapons are born, not made and/or used although i guess saying its the deadliest thing is right i guess. whatever, nuke is strongest now, Anti Matter bomb will be strongest in the future if we last long enough to make one.