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Dug Down Deep: Unearthing What I Believe and Why It Matters: Harris, Joshua: 9781601421517: Amazon.com: Books
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The thought experiment: If I dug down at 1m/s, what would kill me first? - BBC Science Focus Magazine
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Dug Down Deep: Unearthing What I Believe and Why It Matters: Harris, Joshua: 9781601421517: Amazon.com: Books
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