explain xkcd - User contributions [en]

1613: The Three Laws of Robotics

2019-03-27T12:27:45Z

172.69.69.124:

{{comic
| number = 1613
| date = December 7, 2015
| title = The Three Laws of Robotics
| image = the_three_laws_of_robotics.png
| titletext = In ordering #5, self-driving cars will happily drive you around, but if you tell them to drive to a car dealership, they just lock the doors and politely ask how long humans take to starve to death.
}}

==Explanation==
This comic explores alternative orderings of sci-fi author {{w|Isaac Asimov|Isaac Asimov's}} famous {{w|Three Laws of Robotics}}, which are designed to prevent robots from taking over the world, etc. These laws form the basis of a number of Asimov works of fiction, including most famously, the short story collection ''{{w|I, Robot}}'', which amongst others includes the very first of Asimov's stories to introduce the three laws: {{w|Runaround (story)|Runaround}}.

The three rules are:
#A robot may not injure a human being or, through inaction, allow a human being to come to harm.
#A robot must obey the orders given it by human beings except where such orders would conflict with the First Law.
#A robot must protect its own existence as long as such protection does not conflict with the First or Second Laws.

In order to make his joke, [[Randall]] shortens the laws into three imperatives:
#Don't harm humans
#Obey Orders
#Protect yourself

And then implicitly adds the following to the end of each law regardless of order of imperatives:
#''[end of statement]''
#_____, except where such orders/protection would conflict with the First Law.
#_____, as long as such orders/protection does not conflict with the First or Second Laws.

This comic answers the generally unasked question: "Why are they in that order?" With three rules you could rank them into 6 different {{w|permutation|permutations}}, only one of which has been explored in depth. The original ranking of the three laws are listed in the brackets after the first number. So in the first example, which is the original, these three numbers will be in the same order. For the next five the numbers in brackets indicate how the laws have been re-ranked compared to the original.

The comic begins with introducing the original set, which we already know will give rise to a balanced world, so this is designated as green.:
;Ordering #1 - Balanced World: If they are not allowed to harm humans, no harm will be done disregarding who gives them orders. So long as they do not harm humans, they must obey orders. Their own self-preservation is last, so they must also try to save a human, even if ordered not do so, and especially also if they would put themselves to harm, or even destroy themselves in the process. They would also have to obey orders not relating to humans, even if this would be harmful to them; like exploring a mine field. This leads to a balanced, if not perfect, world. Asimov's robot stories explore in detail the advantages and challenges of this scenario.

Below this first known option, the five alternative orderings of the three rules are illustrated. Two of the possibilities are designated yellow (pretty bad or just annoying) and three of them are designated red ("Hellscape").

;Ordering #2 - Frustrating World: The robots value their existence over their job and so many would refuse to do their tasks. The silliness of this is portrayed in the accompanying image, where the robot (a {{w|Mars rover}} looking very similar to {{w|Curiosity (rover)|Curiosity}} both in shape and size - see [[1091: Curiosity]]) laughs at the idea of doing what it was clearly built to do (explore {{w|Mars}}) because of the risk. In addition to the general risk (e.g. of unexpected damage), it is actually normal for rovers to cease operating ("die") at the end of their mission, though they may survive longer than expected (see [[1504: Opportunity]] and [[695: Spirit]]). This personification is augmented by the robot being switched on already while still on Earth and then ordered by [[Megan]] to go explore. The personification is humorous since it is a very nonhuman robot - a typical Mars rover, as has often been used in earlier comics.
;Ordering #3 - Killbot Hellscape: This puts obeying orders above not harming humans, which means anyone could send them on a killing spree, resulting in a "Killbot Hellscape". It should also be noted humor is derived from the superlative nature of "Killbot Hellscape", as well as its over the top accompanying image, where there are multiple mushroom clouds (not necessarily nuclear). It also appears there are no humans (left?), only fighting robots.
;Ordering #4 - Killbot Hellscape:The next would also result in much the same, the only difference here is that they would be willing to kill humans to protect themselves. But still they would need an order to start killing.
;Ordering #5 - Terrifying Standoff:The penultimate order would result in an unpleasant world, though not a full Hellscape. Here the robots would not only disobey to protect themselves, but also kill if necessary. The absurdity of this one is further demonstrated with the very un-human robot happily doing repetitive mundane tasks but then threatening the life of its user, [[Cueball]], if he as much as considers unplugging it.
;Ordering #6 - Killbot Hellscape:The last order would also results in a Hellscape wherein robots not only kill for self-defense but will also go on killing sprees if ordered as long as they didn't risk themselves. Could self-protection coming first not prevent the fighting? Not according to Randall. See discussion below.

There are thus only three different results except the 'normal' 3-laws scenario.

One result goes again three times, and this occurs whenever ''obeying orders'' comes before ''don't harm humans''. In this case it will only be a matter of time (knowing human nature and history) before someone orders the robots to kill some humans, and this will inevitably lead to the ''killbot hellscape'' scenario shown in the third, fourth and sixth law-order. Even in the last case where ''protect yourself'' comes before obey orders, it would only be a matter of time before they would begin to defend themselves, against either humans or other robots which were actively trying to ensure that they would not be harmed by other humans/robots. So although it would be in the robots interest not to have war, this will surely occur anyway. Additionally, the robots would have to be intelligent to realize that they just needed to not go to war to protect themselves. There is nothing in this comic that indicates that the robots should be highly intelligent (like to AI in [[1450: AI-Box Experiment]]).

In the two other cases ''obey orders'' comes after ''don't harm humans'' (as in the original version). But the result is very different both from the original and from each other.

The frustrating world comes by because although the robots will not harm the humans, they will also not harm themselves. So if our orders conflict with this, they just do not perform the orders. As many robots are created to perform tasks that are dangerous, these robots would become useless, and it would be a frustrating world to be a robotic engineer. Asimov touched on this in the story Runaround, where an expensive robot with a strengthened third law got into an endless loop due to a weak order.

Finally in the terrifying standoff situation the ''protect your self'' comes before ''don't harm humans''. In this case they will leave us be, as long as we do not try to turn them off or in any other way harm them. As long as we do that they will be able to help us, with non-dangerous tasks, as in the previous version. But if ever any humans begin to attack them, we could still tip the balance over and end up in a full-scale war (Hellscape). Hence the standoff-label.

The title text further adds to ordering #5 ("Terrifying Standoff") by noting anyone wishing to trade in their self-driving car could be killed, despite it (currently) being a standard and mundane and (mostly) risk-free activity. Because the car would fear that it would end up as scrap or spare parts, it decides to protect itself. And although not directly harming the person inside it, they do also not allow them out, and they have time to wait for starvation (or rather dying of thirst). Asimov created the "inaction" clause in the original First Law specifically to avoid scenarios in which a robot puts a human in harm's way, knowing full well that it is within the robot's abilities to save the human, and then simply refrains from saving them; this was explored in the short story {{w|Little Lost Robot}}.

Another course of action by an AI, completely different than any of the ones presented here, is depicted in [[1626: Judgment Day]].

==Transcript==
:[Caption at the top of the comic:]
:'''Why Asimov put the Three Laws'''
: '''of Robotics in the order he did.'''

:[Below are six rows with first two frames and then a label in color to the right. Above the two column of frames there are labels as well. In the first column six different ways of ordering the three laws are listed. Then the second column shown an image of the consequences of this order. Except in the first where there is a reference. The label to the right rates the kind of world that order of the laws would result in.]

:[Labels above the columns.]
:Possible ordering
:Consequences

:[The six rows follows below. First the text in the first frame, then a description of the second frame, including possible text below and finally the colored label.]

:[First row:]
:1. (1) Don't harm humans
:2. (2) Obey Orders
:3. (3) Protect yourself
:[Only text in square brackets:]
::[See Asmiov’s stories]
:'''Balanced world'''

:[Second row:]
:1. (1) Don't harm humans
:2. (3) Protect yourself
:3. (2) Obey Orders
:[Megan points at a mars rover with six wheels, a satellite disc, an arm and a camera head turned towards her, what to do.]
:Megan: Explore Mars!
:Mars rover: Haha, no. It’s cold and I’d die.
:'''Frustrating world'''

:[Third row:]
:1. (2) Obey Orders
:2. (1) Don't harm humans
:3. (3) Protect yourself
:[Two robots are fighting. The one to the left has six wheels, a tall neck on top of the body, with a head with what could be a camera facing right. It has something pointing forward on the body, which could be a weapon. The robot to the right, seems to be further away into the picture. (it is smaller with less detail). It is human shapes, but made op of square structures. It has two legs and two arms, a torso and a head. It clearly shoots something out of it’s right “hand”. This shot seems to create an explosion a third of the way towards the left robot. There are two mushroom clouds from explosions behind both robots (left and right). Between them there are one more explosion up in the air close to the left robot, and what looks like a fire on the ground right between them. Furthermore there are two missiles in the air, one above the head of each robot. Lines indicate their trajectory. There is not text.]
:'''Killbot hellscape'''

:[Fourth row:]
:1. (2) Obey Orders
:2. (3) Protect yourself
:3. (1) Don't harm humans:
:[Exactly the same picture as in row 3.]
:'''Killbot hellscape'''

:[Fifth row:]
:1. (3) Protect yourself
:2. (1) Don't harm humans
:3. (2) Obey Orders
:[Cueball is standing in front of a car factory robot, that are larger than him. It has a base, and two parts for the main body, and then a big “head” with a small section on top. To the right something is jutting out, and to the left in the direction of Cueball there is an arm in three sections (going down, up and down again) ending in some kind of tool close to Cueball.]
:Car factory robot: I'll make cars for you, but try to unplug me and I’ll vaporize you.
:'''Terrifying standoff'''

:[Sixth row:]
:1. (3) Protect yourself
:2. (2) Obey Orders
:3. (1) Don't harm humans:
:[Exactly the same picture as in row 3 and 4.]
:'''Killbot hellscape'''

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Megan]]
[[Category:Artificial Intelligence]]
[[Category:Robots]]
[[Category:Mars rovers]]

2123: Meta Collecting

2019-03-13T18:09:28Z

172.69.69.124: add dashes and describe the picture a little more

{{comic
| number = 2123
| date = March 13, 2019
| title = Meta Collecting
| image = meta_collecting.png
| titletext = I'm trying to get the page locked because some jerk keeps adding "Yachts".
}}

==Explanation==
{{incomplete|Created by a YACHT. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}

This is another comic in the "[[:Category:My Hobby|My Hobby]]" series.

Many people's hobbies involve {{w|collecting}} many items of the same category—post stamps, collectible cards, painted dolls, wine, and so on. Just about anything can be collected, but for some reason, some things are collected much more often than others. Wikipedia has a page listing the most popular categories of such {{w|collectable}} items.

In Randall's usual style of going meta with everything, he decided to start a meta-collection—a collection of examples of different things that people can collect. He uses the Wikipedia's {{w|list of collectables}} for reference. In the comic, Cueball is showing to his friend his collection of various items that have nothing in common except that they're all popular collectibles.

In title text, Randall complains about a troll who keeps adding {{w|yacht}}s to the list of collectables—mostly because it would force him to buy a yacht if he ever wanted to complete his collection of collectables. Yachts are traditionally considered immensely expensive. Note that Randall does not specify how he is trying to get the page locked, and the comic itself might be a rather meta way of doing so: xkcd fans have a history of making lots of edits to Wikipedia articles Randall mentions, resulting in them being protected or locked.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[The comic depicts Cueball reading from a list to White Hat, standing next to a case filled with collectables including an urn, a model ship, a compact disc, a vinyl record, a doll, a martini glass, and a teapot.]
:Today we're looking for a lunchbox, a snow globe, a Maytag dryer, a Harley Davidson, and a stamp.

:[Caption below the frame:]
:My hobby: Collecting one item from every category listed on Wikipedia's "List of collectables."

{{comic discussion}}

[[Category:My Hobby]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring White Hat]]
[[Category:Wikipedia]]

2123: Meta Collecting

2019-03-13T18:05:51Z

172.69.69.124: move links to earlier/more logical locations

{{comic
| number = 2123
| date = March 13, 2019
| title = Meta Collecting
| image = meta_collecting.png
| titletext = I'm trying to get the page locked because some jerk keeps adding "Yachts".
}}

==Explanation==
{{incomplete|Created by a YACHT. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}

This is another comic in the "[[:Category:My Hobby|My Hobby]]" series.

Many people's hobbies involve {{w|collecting}} many items of the same category - post stamps, collectible cards, painted dolls, wine, and so on. Just about anything can be collected, but for some reason, some things are collected much more often than others. Wikipedia has a page listing the most popular categories of such {{w|collectable}} items.

In Randall's usual style of going meta with everything, he decided to start a meta-collection - a collection of examples of different things that people can collect. He uses the Wikipedia's {{w|list of collectables}} for reference. In the comic, Cueball is showing to his friend his collection of various items that have nothing in common except that they're all popular collectibles.

In title text, Randall complains about a troll who keeps adding {{w|yacht}}s to the list of collectables - mostly because it would force him to buy a yacht if he ever wanted to complete his collection of collectables. Yachts are traditionally considered immensely expensive. Note that Randall does not specify how he is trying to get the page locked, and the comic itself might be a rather meta way of doing so: xkcd fans have a history of making lots of edits to Wikipedia articles Randall mentions, resulting in them being protected or locked.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}

:[The comic depicts Cueball reading from a list to White Hat, standing next to a case filled with "collectables" such as a model ship or a vinyl record.]
:Today we're looking for a lunchbox, a snow globe, a Maytag dryer, a Harley Davidson, and a stamp.

:[Caption below the frame:]
:My hobby: Collecting one item from every category listed on Wikipedia's "List of collectables."

{{comic discussion}}

[[Category:My Hobby]]
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring White Hat]]
[[Category:Wikipedia]]

2120: Brain Hemispheres

2019-03-06T23:56:06Z

172.69.69.124: specific blue

{{comic
| number = 2120
| date = March 6, 2019
| title = Brain Hemispheres
| image = brain_hemispheres.png
| titletext = Neurologically speaking, the LEFT hand is actually the one at the end of the RIGHT arm.
}}

==Explanation==
{{incomplete|Created by an AUTONOMOUS LEG and a CHICKEN. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is thought that the right half of the brain controls the left arm and left leg, and vice versa for the left half of the brain, [https://arxiv.org/pdf/1003.1872.pdf competing] [https://link.springer.com/article/10.1007%2FBF02972358 theories] exist for why this is the case. Also, many people incorrectly argue that different parts of the brain control logic and emotion, due to the importance of the [[https://www.sciencedirect.com/science/article/pii/S0028393211000285?via%3Dihub left]] brain for language processing. Randall joins and spoofs these by suggesting that the right brain instead controls the upper torso. This would suggest that your left leg moves independently of your brain. To explain the areas of the body controlled by both halves of the brain, Randall declares those sections "disputed," which suggests that the halves of your brain fight for control of the region.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[A stick figure with the right half of the figure's brain (on the viewer's left) colored orange and the left half (on the viewer's right) colored iris blue. An iris blue box is overlaid over the right half of the figure's body (on the viewer's left), and an orange box is overlaid over the top half. An arrow labeled 'DISPUTED/DUAL CONTROL' points towards the overlapping area.]
:'''Neuroscience Fact:'''
:The LEFT half of the brain actually controls the RIGHT half of the body... [Arrow pointing to iris blue rectangle]
:...while the RIGHT half of the brain actually controls the TOP half of the body. [Arrow pointing to orange rectangle]
:This leg is fully autonomous. [Arrow pointing to stick figure's left leg (on the viewer's right)]

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Comics featuring Cueball]]
[[Category:Biology]]

2120: Brain Hemispheres

2019-03-06T23:51:20Z

172.69.69.124: left and right confusion

{{comic
| number = 2120
| date = March 6, 2019
| title = Brain Hemispheres
| image = brain_hemispheres.png
| titletext = Neurologically speaking, the LEFT hand is actually the one at the end of the RIGHT arm.
}}

==Explanation==
{{incomplete|Created by an AUTONOMOUS LEG and a CHICKEN. Please mention here why this explanation isn't complete. Do NOT delete this tag too soon.}}
It is thought that the right half of the brain controls the left arm and left leg, and vice versa for the left half of the brain, [https://arxiv.org/pdf/1003.1872.pdf competing] [https://link.springer.com/article/10.1007%2FBF02972358 theories] exist for why this is the case. Also, many people incorrectly argue that different parts of the brain control logic and emotion, due to the importance of the [[https://www.sciencedirect.com/science/article/pii/S0028393211000285?via%3Dihub left]] brain for language processing. Randall joins and spoofs these by suggesting that the right brain instead controls the upper torso. This would suggest that your left leg moves independently of your brain. To explain the areas of the body controlled by both halves of the brain, Randall declares those sections "disputed," which suggests that the halves of your brain fight for control of the region.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
:[A stick figure with the right half of the figure's brain (on the viewer's left) colored orange and the left half (on the viewer's right) colored blue. A blue box is overlaid over the right half of the figure's body (on the viewer's left), and an orange box is overlaid over the top half. An arrow labeled 'DISPUTED/DUAL CONTROL' points towards the overlapping area.]
:'''Neuroscience Fact:'''
:The LEFT half of the brain actually controls the RIGHT half of the body... [Arrow pointing to blue rectangle]
:...while the RIGHT half of the brain actually controls the TOP half of the body. [Arrow pointing to orange rectangle]
:This leg is fully autonomous. [Arrow pointing to stick figure's left leg (on the viewer's right)]

{{comic discussion}}

[[Category:Comics with color]]
[[Category:Comics featuring Cueball]]
[[Category:Biology]]

Talk:2115: Plutonium

2019-02-22T17:35:50Z

172.69.69.124:

Even though space is cold, it conducts so poorly that spacecraft would probably have more problems getting rid of heat than keeping heat, considering how isolated they are. [[User:Tharkon|Tharkon]] ([[User talk:Tharkon|talk]]) 16:43, 22 February 2019 (UTC)

- It actually has little to do with conduction; the heat radiates pretty effectively, especially as it gets "hotter" vs the surrounding radiation. [[Special:Contributions/172.69.69.124|172.69.69.124]] 17:35, 22 February 2019 (UTC)

Reminds me of reddit.com/r/outside [[User:Linker|Linker]] ([[User talk:Linker|talk]]) 16:54, 22 February 2019 (UTC)

2097: Thor Tools

2019-01-12T02:20:57Z

172.69.69.124: Title of the comic is Thor Tools instead of Thor Weapons.

{{comic
| number = 2097
| date = January 11, 2019
| title = Thor Tools
| image = thor_tools.png
| titletext = CORRECTION: After careful evaluation, we have determined that the axis label on this chart was printed backward.
}}

==Explanation==
{{incomplete|Add a list of the tools in the comic. Do NOT delete this tag too soon.}}

{{w|Thor}} is a god of lightning and thunder in Norse mythology. His signature weapon is a magic hammer called {{w|Mjölnir}}. He's likely best known for his role in {{w|Thor (Marvel Comics)|Marvel comics and films}}, which his appearance here seems to be referencing.

Although the hammer was historically a weapon, this comic interprets it as it would more commonly be interpeted today -- as a tool. The comic is listing various hand tools in order of utility and viability as Thor's weapon, besides his actual, enchanted hammer. Hammers are heavy, blunt, and can do large amounts of damage to an opponent, whereas a hand plane is sharp, but only in one place, and will only inflict surface wounds.

Some of these tools require power, which would generally require Thor to stay near an outlet or keep a battery charging, such as the circular saw, or Dremel. However, being the god of lightning may allow him to circumvent this. Thor would also need compressed air for the nail gun or jackhammer, only allowing Thor so many shots before reloading the air tank at an outlet, or via a concentrated wind storm.

The nail gun and staple gun would also require nails or staples respectively to function as a weapon. Although Mjölnir is believed to return to Thor if thrown, it's not clear how similar system could work with nails and staples.

In the title text, Munroe says the the order should be reversed. Considering that the title of the comic is "Thor Tools" ("tools", instead of "weapons"), the argument seems to be that a hammer is less useful than the rest, by seeing them as tools and not as weapons.

A few other interpretations of this could be:
* Randall proposes that Thor armed with a plane or digital calipers would be much more fearsome than with a hammer.
* The "value" of the more strange-seeming items would be much higher than his tradition hammer, perhaps more gory or more humorous.
* "Best" and "worst" are to be interpreted for Thor's enemies rather than Thor himself.

==Transcript==
{{incomplete transcript|Do NOT delete this tag too soon.}}
[A timeline labeled "Hand tools Thor could have ended up with" with "Best" on the left and "Worst" on the right.]

[Points on the line are labeled "Hammer", "Axe", "Claw hammer", "Circular saw", "Jackhammer", "Shovel", "Socket wrench", "Bolt cutters", "Hacksaw", "Nail gun", "Staple gun", "Coping saw", "Screwdriver (flat)", "Ball-peen hammer", "Screwdriver (phillips)", "Awl", "Digital Caliper", "Dremel", "Plane"]

[A figure wearing a winged helmet is seen preparing to use: a Circular saw, a Socket wrench, a Nail or Staple gun, and a Dremel.]

{{comic discussion}}

135: Substitute

2018-05-28T20:11:57Z

172.69.69.124: /* Explanation */

{{comic
| number = 135
| date = July 31, 2006
| title = Substitute
| image = substitute.png
| titletext = YOU THINK THIS IS FUNNY?
}}

==Explanation==
This comic refers to the film ''{{w|Jurassic Park (film)|Jurassic Park}}'', a 1993 movie based on the 1990 novel by {{w|Michael Crichton}}. The film centers around a billionaire who bought an island and opened a zoo or theme park for dinosaurs that he has cloned from DNA recovered from blood found in fossilized mosquitoes. After a computer programmer shuts down the security systems to steal embryos for a rival company, several of the creatures, among which are the {{w|Velociraptor}}s subject of this comic, run loose and try to devour every human in the theme park.

Velociraptors (often shortened to "raptors") are a species of relatively small, carnivorous {{w|dinosaur}} that play a central role in the original film, as well as its sequels. In the film, herds of Velociraptors antagonize the main characters at various points, even entering buildings. According to newer researches, the Velociraptors in the film were erroneously based on the {{w|Utahraptor}} species of dinosaur. Unlike the movie, in which they are depicted as having a reptilian skin, both species of dinosaur in reality are theorized to have been feathered. The word "raptor" also refers to modern {{w|Bird of prey|birds of prey}}.

[[Randall]] is asked to substitute for [[Miss Lenhart]] in math class. The first page of the test he devises contains three questions, which have the recurring theme of humans running from said velociraptors. For the answers, see the [[135: Substitute #Trivia|trivia section.]] As Randall says in the comic: "This material is more vital than anything you've ever learned," the joke being that Randall is somehow fearful that such a thing could happen.

Velociraptors, and in particular, the irrational fear of being attacked by them in the modern world, [[:Category:Velociraptors|appear several times]] in [[xkcd]]. This is the second such instance; the first is [[87: Velociraptors]]

In the title text Randall asks the kids whether they find this possibility humorous (and they rightfully should, considering that the chances of such a thing occuring are astronomically low).

==Transcript==
:[In a classroom, the board says "Math" on the top-left corner, and "Mr. Munroe" in the middle. A Cueball portrays Randall, standing in front of it, speaking to the class.]
:Randall: Miss Lenhart couldn't be here today, so she asked me to substitute.
:Randall: I've put out your tests. Please get started.

:[A student in the first row raises the exam paper and says.]
:Student: Mr. Munroe, Miss Lenhart never taught us this.

:Randall: That's because Miss Lenhart doesn't understand how important certain kinds of math are.
:Student: But this just looks--
:Randall: This material is more vital than anything you've ever learned
:Student: But--
:Randall: No buts.

:Randall: This is a matter of life and death.

:[Excerpt from the exam paper.]
:<tt>Name: _________</tt>

:[A stick figure is standing, hands over head. A velociraptor is running towards it.]

:<tt>1. The velociraptor spots you 40 meters away and attacks, accelerating at 4 m/s^2 to its top speed of 25 m/s. When it spots you, you begin to flee, quickly reaching your top speed of 6 m/s. How far can you get before you're caught and devoured?</tt>

:<tt>2. You're at the center of a 20m equilateral triangle with a raptor at each corner. The top raptor has a wounded leg and is limited to a top speed of 10 m/s.</tt>

:[A stick figure is shown in the above situation. The picture has a legend "<tt>(Not to scale)</tt>".]

:<tt>The raptors will run toward you. At what angle should you run to maximize the time you stay alive?</tt>

:<tt>3. Raptors can open doors, but they are slowed by them. Using the floor plan on the next page, plot a route through the building, assuming raptors take 5 minutes to open the first door and halve the time for each subsequent door. Remember, raptors run at 10 m/s and they do not know fear.</tt>

==Trivia==
*Answers to the first two questions can be found in [http://fora.xkcd.com/viewtopic.php?f=7&t=120&start=40 this topic] on the forum board.
**The first is 37.5 meters.
**The second is 18.6 degrees to either side of the wounded raptor.

{{comic discussion}}
[[Category:Comics featuring Miss Lenhart]]
[[Category:Comics featuring Randall Munroe]]
[[Category:Comics featuring real people]]
[[Category:Comics with color]]
[[Category:Velociraptors]]
[[Category:Animals]]
[[Category:Math]]
[[Category:Physics]]
[[Category:Science]]
[[Category:Comics featuring Cueball]]