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What if you made a jetpack using rifles?

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What if you made a jetpack using rifles?

Get a copy of What If? 2 and Randall’s other books at: https://xkcd.com/books More serious answers to absurd questions at: https://what-if.xkcd.com/ This question comes from Rob, who asks: is it possible to build a jetpack using downward firing rifles? I was sort of surprised to find that the answer was yes! Credits ******* Randall Munroe ...

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XKCD What If Videos

What would the world's largest cities be like if the land masses were rotated by 90 degrees?

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What would Earth's climate be like if the land masses were rotated by 90°?

What would Earth's climate be like if the land masses were rotated by 90°?

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xkcd in CSS! (new border-shape api)

xkcd in CSS! (new border-shape api)

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What if ALL the sun’s power was focused in one place?

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