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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.
