The Economist reports on advances in non-lethal weaponry, emphasizing the latest line of research into electro-magnetic weapons: BULLETS and bombs are so 20th-century. The wars of the 21st will be dominated by ray guns. That, at least, is the vision of a band of military technologists who are building weapons that work by zapping the enemy’s electronics, rather than blowing him to bits. The result could be conflict that is less bloody, yet more effective, than what is now seen as conventional battle... The logical conclusion of all this is a so-called “human-safe” missile, which carries an...