21.   His ideas were of central importance in the development of the theory.

22.   I think the idea was that a senior clergy should keep an eye on him, help him and so on.

23.   I think the most exciting idea is to launch an Earth-Moon solar sail race.

24.   Ideas are everything in a fragmented global Marketplace, and great ideas demand a diverse work force.

25.   Ideas are organisations of information that the human mind chooses to put together in a particular way.

26.   Ideas as such are not central in electoral politics.

27.   Ideas of Divine Right were, it is true, becoming increasingly difficult to justify in intellectual terms.

28.   If such ideas were to spread, his own slaves might find them too great a temptation to resist.

29.   In each case the idea is to link a point in the sequence or group with a secure chronological fixed point.

30.   In outline the idea is rather like using the steam produced from a kettle to push die kettle across the room.