27 an example of a food which particularly benefits from the addition of spices.

28 a range of methods for making food safer to eat.

29 a comparison between countries with different climate types.

30 an explanation of how people first learned to select appropriate spices.

31 a method of enhancing the effectiveness of individual spices.

32 the relative effectiveness of certain spices against harmful organisms.

33 the possible origins of a dislike for unspiced foods.