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

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natural ammonium chloride salts (NH4Cl) from the ground—they form naturally from volcanic gases, so you can find these white crystals growing near volcanic vents.
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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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