If I could un-invent one thing from history, it would be the nuclear weapon—not because the science itself is evil, but because its existence permanently tethered human survival to a single point of failure. Nuclear weapons didn’t just change how wars are fought; they changed how civilization lives, under the constant shadow that one miscalculation, accident, or unstable leader could end everything. No invention before or since has given humanity the power to erase itself so completely, so quickly, and so irreversibly.