The greatest threat to world peace is not from nuclear weapons and their possible proliferation. It is from drones and their certain proliferation. Nuclear bombs are useless weapons, playthings for the powerful or those aspiring to power. Drones are now sweeping the global arms market. There are some 10,000 said to be in service, of which a thousand are armed and mostly American. Some reports say they have killed more non-combatant civilians than died in 9/11.