61.   Supercomputers at government research centers, processing data at unprecedented speeds, simulate some of the complexities of a nuclear explosion or the impact of a meteor striking earth.

62.   Such a reaction would not have the force of a nuclear explosion, but it would probably spread radioactive contaminants.

63.   The Air Force has said this proves that the device could not create a nuclear explosion.

64.   The department also wants to build equipment that would replace nuclear weapons tests by duplicating some conditions that exist in a nuclear explosion.

65.   The CIA told the White House on Tuesday that Pakistan could detonate an underground nuclear explosion at any moment.

66.   The computer will be able to simulate the effects of underground nuclear explosions, eliminating the need for actual tests.

67.   The experiments ranged from marching soldiers through nuclear explosion sites without informing them of the risks to injecting people with radioactive substances, again without their knowledge.

68.   The intentional making of tiny nuclear explosions can be difficult for a novice.

69.   The materials would not produce nuclear explosions.

70.   The new computer was built for the U.S. Department of Energy to simulate nuclear explosions.