31.   A lump of plutonium the size of an apple is big enough to build a nuclear bomb.

32.   A report has appeared in The Washington Times that the Chinese may test a small nuclear bomb at Lop Nur, in western China.

33.   A nuclear bomb uses radioactive material such as plutonium or enriched uranium to set off a chain reaction of sub-atomic particles.

34.   A radiation weapon would be easier to assemble than a nuclear bomb.

35.   A rogue nuclear bomb is in play and if it explodes in the United States, the United States may have to strike back at Russia.

36.   A rogue nuclear bomb is in play and if it explodes here, the United States may have to strike back at Russia.

37.   Also, the government will not confirm, but does not rule out, the possibility that Osama bin Laden may be close to developing a crude nuclear bomb.

38.   Brazil and Argentina at one time attempted to develop nuclear bombs but have since renounced their efforts.

39.   But a nuclear bomb delivered by less traditional means could not be tracked at all.

40.   But it was impossible for the United States to tell whether the tunnel was of the type needed to test nuclear bombs.