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| title    = Nanobots
 
| title    = Nanobots
 
| image    = nanobots.png
 
| image    = nanobots.png
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| imagesize =
 
| titletext = I think the IETF hit the right balance with the 128 bits thing. We can fit MAC addresses in a /64 subnet, and the nanobots will only be able to devour half the planet.
 
| titletext = I think the IETF hit the right balance with the 128 bits thing. We can fit MAC addresses in a /64 subnet, and the nanobots will only be able to devour half the planet.
 
}}
 
}}
  
 
==Explanation==
 
==Explanation==
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In this comic, the two characters are in orbit in space while evil nanobots are devouring the earth in a swarm. The nanobots stop after devouring 40% of the planet. This is a take on the "gray goo" scenario in which self-replicating nanobots destroy the earth while creating more and more of themselves non-stop.
  
[[Megan]] and [[Ponytail]] are in orbit while nanobots are devouring the Earth in a swarm. This is a take on the "{{w|Grey goo}}" scenario in which self-replicating nanobots destroy the earth while creating more and more of themselves non-stop.
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However, the nanobots are only able to destroy 40% of the planet because 40% of the earth mass = (# of IPv6 addresses) x (A few cubic microns). Without more IP addresses, the nanobots cannot continue to replicate.
  
Unusually, however, the nanobots stop after devouring 40% of the planet. This is because each individual nanobot must apparently have a distinct {{w|IPv6}} address, and by running out of possible addresses the nanobots cannot produce any more of themselves. With the tiny size of each nanobot, the total volume they can contain is only 40% of the Earth's mass, and they can no longer continue their consumption of the planet.
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This is a joke on the shortage of IPv4 addresses. The only difference is that we are on IPv4 and the nanobots are on IPv6.
  
IPv6 supports approximately 3.4×10<sup>38</sup> addresses, while the {{w|Earth|Earth's mass}} is around 5.972×10<sup>24</sup> kg. Assuming "a few cubic microns" is the minimum of 2 µm<sup>3</sup> (according to [[1070: Words for Small Sets]]), the nanobots would have a density of 4 g/cm<sup>3</sup>, a bit less dense than the Earth.
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1998 is when the first IP address registry was opened and IETF is the Internet Engineering Task Force.  
 
 
This is a joke on the shortage of IPv4 addresses. The only difference is that we are on {{w|IPv4}} and the nanobots are on {{w|IPv6}}.
 
 
 
1998 is when the [http://tools.ietf.org/html/rfc2460 IPv6 Specification (RFC 2460)] was published and IETF is the Internet Engineering Task Force.
 
 
 
Note that an April Fools' joke for [http://tools.ietf.org/html/rfc1606 IPv9] exists and would have guaranteed Earth's doom in this comic's scenario.
 
  
 
==Transcript==
 
==Transcript==
 
:[Megan and commander are on a space station.]
 
:[Megan and commander are on a space station.]
:Megan: Commander! Come quick! It's the nanobots—they've ''STOPPED!''
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:Megan: Commander! Come quick!
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:Megan: It's the nanobots--they've STOPPED!
  
:Megan: They devoured 40% of the Earth, and then just... quit! They're just sitting there! Why?!
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:Megan: They devoured 40% of the Earth, and then just ... quit! They're just sitting there!
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:Megan: Why?!
  
:Ponytail: It's a mystery. ...unless... What's the volume of each nanobot?
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:Ponytail: It's a mystery. ... unless ... What's the volume of each nanobot?
 
:Megan: A few cubic microns. Why?
 
:Megan: A few cubic microns. Why?
 
:Ponytail: I think the year 1998 just bought us some time.
 
:Ponytail: I think the year 1998 just bought us some time.
 +
 
:[Earth's surface, covered in mountains of nanobots.]
 
:[Earth's surface, covered in mountains of nanobots.]
 
 
:In the swarm:
 
:In the swarm:
 
:Nanobot: What do you mean, "Run out of addresses?"
 
:Nanobot: What do you mean, "Run out of addresses?"
:Other Nanobot: Look, we should've migrated away from IPv6 ''AGES'' ago...
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:Other Nanobot: Look, we should've migrated away from IPv6 AGES ago ...
 
 
==Trivia==
 
*On the website, the space above the comic says "xkcd.com now has IPv6 connectivity. If you can't reach it, you or your ISP have misconfigured equipment. Sadly, I now have no way to tell you."
 
 
 
 
 
{{comic discussion}}
 
  
[[Category:Comics with inverted brightness]]
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{{comic discussion}}
 
[[Category:Comics featuring Megan]]
 
[[Category:Comics featuring Megan]]
 
[[Category:Comics featuring Ponytail]]
 
[[Category:Comics featuring Ponytail]]
[[Category:Artificial Intelligence]]
 
[[Category:Singularity]]
 

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