xkcd's What If?
xkcd's What If?'s Channel
 
 
If all humans died, when would the last light go out?
56,052
Could you survive a nanosecond on the Sun?
48,675
What would a magnitude 15 earthquake be like?
45,234
What if everyone pointed a laser at the moon?
34,011
Would a Submarine Work as a Spaceship?
31,739
What if Earth grew 1cm every second?
30,767
What if you funneled Niagara Falls through a straw?
30,349
What if a glass of water were LITERALLY half empty?
24,015
What if you drained the oceans?
20,241
What if you threw a baseball at nearly light speed?
19,760
 
If all humans died, when would the last light go out?
56,052
Could you survive a nanosecond on the Sun?
48,675
What would a magnitude 15 earthquake be like?
45,234
What if everyone pointed a laser at the moon?
34,011
Would a Submarine Work as a Spaceship?
31,739
What if Earth grew 1cm every second?
30,767
What if you funneled Niagara Falls through a straw?
30,349
What if a glass of water were LITERALLY half empty?
24,015
What if you drained the oceans?
20,241
What if you threw a baseball at nearly light speed?
19,760
What if Earth suddenly stopped spinning?
19,655
What if NASCAR had no rules?
19,526
What if you swam in a nuclear storage pool?
18,622
What if you tried to print Wikipedia?
18,495
What if we aimed the Hubble Telescope at Earth?
18,334
What if the Earth rotated 90 degrees?
17,613
What if everyone jumped at once?
15,304
What if we teleported the oceans to Mars?
15,124
What if you built a billion-story building?
13,804
Can you drive west to lengthen the sunset?
11,918
Could you make an umbrella out of lasers?
11,545
But what if we tried MORE power?
11,155
What if we put a pool on the moon?
10,967
How long would you survive with no DNA?
10,691
What if you used a flamethrower as a snowblower?
9,890
What if you literally had all the money in the world?
9,172
What if you had a mole of moles?
9,067
What if the moon turned into a black hole?
8,496
What if the sun suddenly went out?
7,975
 
xkcd's What If?
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xkcd's What If?
Description
What If? The Video Series is the official adaptation of the 'What If?' books by Randall Munroe (xkcd.com) and is produced by Neptune Studios LLC

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chrisrojas3561 (1 year ago)
The check engine light in my car will always be shining
jackdavenport5011 (11 months ago)
Honestly the thought of a bunch of lonely light posts above emergency phones being the last source of light created by humans is kind of hauntingly beautiful
qriminalized (1 year ago)
The immortal hamster powering the White House:
cyb3rfa1ry666 (1 year ago)
someone in grade 7 asked this so we had an entire class with a documentary on earth after humans, it was really cool and she was my favourite teacher, love ya miss A
hazelhazelton1346 (1 year ago)
There is something immensely sad about the thought of an emergency phone in a remote location still being functional even though the world is now void of human life. So if you were the last human, and you found it, you could make a call, but nobody would be there to answer.
sosososcared (5 months ago)
1:57 tom scott reference
napalmsushi3272 (1 year ago)
"Check out this glowing blue stick I found in that hole past all the spikes!"
legrandliseurtri7495 (1 year ago (edited))
1:08 Wait, so you're telling me the Gone series by Michael Grant isn't realistic? A nuclear reactor with no humans would not supply power for weeks because they're built to automatically shut down? Damn.
ZelphTheWebmancer (1 year ago)
The scarier part isn't that the sign at 3:00 was changed from Everyone to 0, but the question who change it?
museofsalzburg2373 (1 year ago)
4:46 That last line is somehow simultaneously concerning and comforting.
evah4431 (1 year ago)
I love the Tom Scott "cameo" at 1:56 !
spinoooguy18 (1 year ago)
4:12 fun fact: legendary Godzilla’s atomic breath and blue glow are actually Cherenkov Radiation
Inflake (10 months ago)
This is the kind of question my brother and I used to have a conversation about before we fall asleep