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1.
▲
Fun numbers estimated, calculated, or found while researching What-If.xkcd.com
twitter.com
discuss
13 years ago
ck2
1 points
2.
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How many radioactive bananas would you need to power a house?
what-if.xkcd.com
168 comments
4 years ago
notRobot
387 points
3.
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Can you use a magnifying glass and moonlight to light a fire? (2016)
what-if.xkcd.com
269 comments
8 years ago
btrask
340 points
4.
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Earth-Moon Fire Pole
what-if.xkcd.com
64 comments
8 years ago
mooreds
262 points
5.
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When (if ever) did the Sun set on the British Empire?
what-if.xkcd.com
41 comments
2 years ago
arizen
71 points
6.
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What happens when a basebal goes at nearly the speed of light (what-if.XKCD)
what-if.xkcd.com
1 comment
14 years ago
jordo37
62 points
7.
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Star Ownership
what-if.xkcd.com
4 comments
4 years ago
rcarmo
54 points
8.
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Safe to swim in nuclear spent fuel pool?
what-if.xkcd.com
8 comments
4 years ago
83457
52 points
9.
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What would happen if you tried to hit a baseball pitched at 90% speed of light?
what-if.xkcd.com
8 comments
8 years ago
molecule
45 points
10.
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Earth-Moon Fire Pole
what-if.xkcd.com
7 comments
6 years ago
duck
28 points
11.
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What's the worst thing to do with a pressure cooker?
what-if.xkcd.com
4 comments
6 years ago
agarttha
28 points
12.
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When – if ever – will the bandwidth of the Internet surpass that of FedEx?
what-if.xkcd.com
1 comment
4 years ago
capableweb
26 points
13.
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What If - By XKCD
what-if.xkcd.com
1 comment
14 years ago
dekayed
23 points
14.
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XKCD What If: Robot Apocalypse
what-if.xkcd.com
discuss
14 years ago
raganesh
22 points
15.
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Earth-Moon Fire Pole
what-if.xkcd.com
4 comments
8 years ago
tosh
21 points
16.
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XKCD What If: Everybody Jump
what-if.xkcd.com
1 comment
14 years ago
raganesh
20 points
17.
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Tatooine Rainbow
what-if.xkcd.com
discuss
10 years ago
mooreds
18 points
18.
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FedEx bandwidth (XKCD What-If?)
what-if.xkcd.com
2 comments
13 years ago
altro
17 points
19.
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Twitter
what-if.xkcd.com
1 comment
13 years ago
czr80
17 points
20.
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XKCD What If - Earth's landmass was rotated 90 degrees?
what-if.xkcd.com
discuss
14 years ago
raganesh
16 points
21.
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Can you use a magnifying glass and moonlight to light a fire?
what-if.xkcd.com
7 comments
10 years ago
dzdt
14 points
22.
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What would happen if you tried to hit a baseball at 90% the speed of light?
what-if.xkcd.com
1 comment
14 years ago
charliesome
13 points
23.
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If Everyone Pointed A Laser Pointer At The Moon Would It Change Color?
what-if.xkcd.com
discuss
14 years ago
koichi
13 points
24.
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A 100ft diamond meteor hits the earth traveling close to the speed of light...
what-if.xkcd.com
1 comment
14 years ago
juiceandjuice
12 points
25.
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Google's Datacenters on Punch Cards
what-if.xkcd.com
2 comments
13 years ago
discountgenius
11 points
26.
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How many bananas would you need to power a house?
what-if.xkcd.com
5 comments
4 years ago
sohkamyung
10 points
27.
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How fast could you visit all 50 states?
what-if.xkcd.com
discuss
12 years ago
monort
10 points
28.
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Would it be possible to launch an unmanned mission to retrieve Voyager I?
what-if.xkcd.com
3 comments
13 years ago
tocomment
8 points
29.
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Is it possible to build a jetpack using downward firing machine guns? (2012)
what-if.xkcd.com
3 comments
3 years ago
ezekg
8 points
30.
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Swimming in a Nuclear Fuel Rod Pool
what-if.xkcd.com
1 comment
12 years ago
jimbobble
8 points
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