From New World Encyclopedia
Unification Aspects:

Yams are an important food crop, satisfying dietary requirements for many people, particularly in Africa and various tropical environments. However, in addition to supplying nutrients, yams also touch upon the human inner nature, providing a delightful taste (for many) and a pleasureable eating experience, whether eaten directly or in desserts, etc. They are also central to various ceremonies and festivals that show their importance in traditional societies of Africa and the Pacific islands. Human creativity is also demonstrated, as many new varieties have been developed.

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teachers and researchers who wish to further pursue these topics from a unification perspective.