The man who invented the neutron bomb, Samuel Cohen has died in California. He was 89. The neutron bomb was a small tactical nuclear weapon which used tiny particles that could zip through tanks, walls or buildings with minimal damage but kill humans, usually by attacking their central nervous system. It also minimized long-term nuclear contamination. Mr Cohen called it the most sane weapon ever devised, but anti-nuclear campaigners in 1980s denounced it as a capitalist device.