1.   All this in a world flashing with transporters, spaceships and doomsday weapons.

2.   Then it was purely a doomsday weapon designed to make a nuclear bomb drop on the former Soviet Union.

3.   He no longer believed that a doomsday weapon was necessary.

4.   In his Nobel lecture, Rotblat called on his colleagues to refuse to support and even to expose secret plans for doomsday weapons.

5.   Rotblat said the doomsday weapons must be destroyed quickly, hopefully within a decade.