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Nobody "invented" iron, it's an element, and people have known about it for thousands of years. Until recently, people could easily get enough iron from their food, and did not need suplements very often. By contrast, we now must add iron to our food (for example, cereal) in order to get enough iron for our blood to oxygenate.

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10y ago
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Q: Who invented iron and why does it have to go in cereal?
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