Spinach Iron Levels Nutrition Myths
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In 1870, German chemist Erich von Wolf was researching the nutritional benefits of spinach. He accidentally increased the vegetable’s iron level to 10 times the actual amount: 3.5 grams of iron suddenly became 35 grams.Tiny Fox Lab Facts

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Source: https://www.businessinsider.com/spinach-typo-popeye-2014-1