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Jennifer HayThirty years ago, 25 January 1958, the director of Harwell Laboratory in Britain, called a news conference attended by 400 reporters. He announced that a secret, experimental machine called "Zeta" - Zero Energy Thermonuclear Assembly - had produced constant temperatures in a hydrogen gas of five million degrees centigrade. Neutron measurements indicated that thermonuclear reactions were taking place. Zeta had apparently produced the world's first controlled fusion reaction - he was 90 percent sure, he said, under hard questioning. "To Britain, this discovery is greater than the Russian Sputnik."