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How to Invent Everything: A Survival Guide for the Stranded Time Traveler, by Ryan North

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Iodized salt is one of the simplest and cheapest public health measures humans have ever come up with, and it enhances both physical health and intelligence at the same time:
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How to Invent Everything: A Survival Guide for the Stranded Time Traveler
How to Invent Everything: A Survival Guide for the Stranded Time Traveler
by Ryan North
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