The humble potato is a tuber originally cultivated in Peru. When properly prepared potatoes can satisfy (almost) all human nutritional needs. The potato was responsible for the health of the Irish population during past centuries. Unfortunately, over reliance on potatoes resulted in widespread famine when potatoes crops failed.
Wikipidia article about Potatoes
Wikipidea article about Irish potatoes famine
Article about Agricultural advocacy group
A recipe Twice baked potatoes
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