xkcd's What If?

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2025
2025x1
What if you built a billion-story building?
Episode overview
his question came from Keira, who at age four and a half wanted to build a billion-story building. Actually, it came from Keira’s dad, who wanted to help Keira appreciate how big and difficult such a project would be.
2025x2
What if the wise men kept walking after Jesus's birth?
Episode overview
This question comes from N. Murdoch, who was thinking about how the three wise men in the Christmas story followed a star to Bethlehem where they found the baby Jesus. The question is: .. show full overview
2025x3
What if the Earth rotated 90 degrees?
Episode overview
What would the world be like if the land masses were spread out the same way as now, but rotated by 90 degrees?
2025x4
What if the sun suddenly went out?
Episode overview
What would happen to the Earth if the Sun suddenly switched off? is probably the single most popular question submitted to What If.
2025x5
What if you literally had all the money in the world?
Episode overview
his question comes from Daniel, who notes that people sometimes say “If I had all the money in the world …” in order to discuss what they would do if they had no financial constraints. .. show full overview
2025x6
What if you used a flamethrower as a snowblower?
Episode overview
This question comes from Matt, who asks: I've long thought about putting a flamethrower on the front of a car to melt snow and ice before you drive across it. Now I've realized that a .. show full overview
2025x7
What if you funneled Niagara Falls through a straw?
Episode overview
his question comes from David, who asks: what would happen if one tried to funnel Niagara Falls through a straw?
2025x8
What if the moon turned into a black hole?
Episode overview
This question comes from Matt, who asks: what would happen if the Moon were replaced with an equivalently-massed black hole? And what would a lunar ("holar"?) eclipse look like?
2025x9
What if you had a mole of moles?
Episode overview
his question comes from Sean, who asks: what would happen if you were to gather a mole (the unit of measurement) of moles (the small furry critter) in one place?
2025x10
What if the Moon were made entirely of electrons?
Episode overview
This question comes from Noah, who asks: what if the Earth were made entirely of protons, and the Moon were made entirely of electrons?
2025x11
Could we survive eating only humans?
Episode overview
This question comes from Quinn, who asks: How long could the human race survive on only cannibalism?
2025x12
Can you drive west to lengthen the sunset?
Episode overview
This question comes from Michael, who asks: what’s the longest possible sunset you can experience while driving, assuming you’re obeying the speed limit and driving on paved roads? To start, we have to define what we mean by “sunset".