How many radioactive bananas would you need to power a house?

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@what-if.xkcd.com | 1 year ago

Orbital Speed

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@what-if.xkcd.com | 2 years ago

What If You Swam in a Spent Fuel Pool?

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@what-if.xkcd.com | 3 years ago

Billion-Story Building

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@what-if.xkcd.com | 3 years ago

What's the worst thing to do with a pressure cooker?

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@what-if.xkcd.com | 3 years ago

Gas mileage is measured in square meters

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@what-if.xkcd.com | 4 years ago

Expensive Shoebox (2014)

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@what-if.xkcd.com | 4 years ago

What-If: Serious Scientific Answers to Absurd Hypothetical Questions

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@what-if.xkcd.com | 4 years ago

FedEx Bandwidth

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@what-if.xkcd.com | 5 years ago

You can't start a fire with moonlight no matter how big your magnifying glass is

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@what-if.xkcd.com | 5 years ago

What would happen if you tried to hit a baseball pitched at 90% speed of light?

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@what-if.xkcd.com | 5 years ago

What if?

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@what-if.xkcd.com | 5 years ago

Earth moon firepole

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@what-if.xkcd.com | 5 years ago