41.  During the Cold War, the United States used the threat of nuclear attack to deter a Soviet attack on Western Europe.

42.  Earlier this month, the American media disclosed that a Pentagon review of its nuclear policy identified North Korea as a potential target for a nuclear attack.

43.  During the Cold War, U.S. satellites watched for Soviet missile launches, a sign that the United States might soon be under nuclear attack.

44.  Even in the first horrified moments, this was never seen as a nuclear attack by a foreign power.

45.  Had a virus or a nuclear attack struck San Francisco?

46.  He also did important work in contriving measures to strengthen U.S. missile silos to make them less vulnerable to nuclear attack.

47.  He was probably glad the teachers made us practice nuclear attack drills by diving under our desks at school.

48.  I am convinced that they, like the cockroach, would scoff at a nuclear attack.

49.  In fact, they may well decide they need nuclear weapons to avoid nuclear attack.

50.  In the clip shown at the Fox presentation on Thursday, the Beene family spends a weekend in a bomb shelter, fearing a nuclear attack.