explain xkcd - User contributions [en]

Talk:890: Etymology

2015-04-22T22:08:28Z

108.162.221.246:

It always bothered me how an independent gunslinger with no team of engineers or assistants has a faster ship than the entirety of the empire and all it's technical expertise. Where did he get his funding and kit from? '''[[User:Davidy22|{{Color|purple|David}}y²²]]'''[[User talk:Davidy22|<tt>[talk]</tt>]] 10:09, 9 March 2013 (UTC)

The same place as the Falcon.... gambling with people like Lando? (Also Falconry, by whatever name, was practiced in Mesopotamia and by the Bedouin in arguably at least partially desert-planet-like areas. It's quite possible that the ancestral 'Falcons' or equivalent translator-microbe-referenced creatures originated ''on'' Tatooine. A long, long time later, in a galaxy (and planet) much, much less far away (basically, here... and now) our Earth falcons are at least one branch of descendents.) Now, no doubts "Millenium" refers to the Imperial (previously Republican) standard years, but it begs the question of what the length and nature of the Tattooine 'year' is, given it's a binary-star orbitter, eh? ;) [[Special:Contributions/178.99.81.144|178.99.81.144]] 16:51, 30 April 2013 (UTC)

He won the ship from Lando, that guy owned his own city. Military ships carry much more equipment and are less manoeuvrable. [[Special:Contributions/184.66.160.91|184.66.160.91]] 19:21, 16 July 2013 (UTC)
:Plus, most commercial and government ships have extra equipment for safety and reliability. If you take a car, strip everything out of it, and put a nitrous oxide injection system in it, it will be faster than any cop car. The cop car will be able to withstand an accident much better (they are often rated for 70-mph rear-end collisions) and will typically start every time the key is turned.
: Oh, and I think Lando did not yet run Cloud City when Han won the Falcon from him. I recall Han being surprised to find out Lando had won Cloud City, in The Empire Strikes Back. [[User:Tryc|Tryc]] ([[User talk:Tryc|talk]]) 16:45, 23 July 2013 (UTC)

In George Lucas' novelization of the first movie (which I have heard was ghosted by Alan Dean Foster), Obi-Wan remarks to Luke that "Even a duck must be taught how to swim." And Luke replies, "What's a duck?" In another place, Luke was thinking "about a dog he had once owned" right before another event (I believe it was a ship going into hyperspace). [[Special:Contributions/108.162.221.246|108.162.221.246]] 22:08, 22 April 2015 (UTC)

1479: Troubleshooting

2015-01-28T19:14:08Z

108.162.221.246: /* Explanation */ fix title text explanation error

{{comic
| number = 1479
| date = January 28, 2015
| title = Troubleshooting
| image = troubleshooting.png
| titletext = "Oh, you're using their Chrome APP, not their Chrome EXTENSION. They're very similar but one handles window creation differently." is a thing I hope I can stop saying soon.
}}

==Explanation==
This comic revolves around the complexity and somewhat low quality of modern software. Many problems that users experience are not obvious or straightforward, and methods for correcting the root cause the problem requires on invoking unrelated actions that happen to cause a desired side-effect. Knowing the non-obvious cause, the desired side effect, and how to trigger the unrelated feature that causes it requires memorization of lots of "stupid computer knowledge" rather than general principles and logical investigation of the software.

One particular example of an illogical fix to a software problem is depicted in the comic. Here, [[Cueball]] is trying to help [[Hairy]] resolve the problem of a program that is not responding to any mouse clicks. Cueball (correctly?) surmises that this is not due to abnormal behavior of the software ("{{w|Hang (computing)|freezing}}"), but rather because either the user or the software itself has opened a {{w|Modal dialog|modal dialog window}} outside of the main screen area, where it can not be seen. Modal dialog windows block access to the rest of the application, by seizing the sole focus of the user input. They are valid {{w|GUI}} tools and are used when the software needs user's input before it can proceed further. However, opening such window and placing it outside of the visible screen area ("off-screen") will make the window both inaccessible and invisible to the user, precluding them from closing it and re-gaining access to the software.

One non-obvious way to repair such problem is to switch the screen resolution; Switching the resolution in itself does not fix the problem, but the resolution switch also forces the operating system to redraw all windows on the desktop and, some operating systems will also validate the coordinates of all windows and adjust these coordinates so that the windows do not end up in off-screen area. In this scenario, it is used as a side-effect to fix the problem, because operating systems rarely provide other, more obvious ways to bring the off-screen windows back to the visible area.

By saying "Why is it even possible?", Hairy is quite correct in pointing out that the best way to address this problem at its root would be for the operating system developers to prevents the creation of windows off-screen, preventing a whole class of window management problems before the can occur. Such mechanisms could validate coordinates during window creation, thus making sure that the dialog window would always be accessible and visible.

In general, one can sort the possible solutions to the problem being discussed in the following order of preference, from best to worst:
* (Best): Have OS programmers implement automatic coordinate adjustment during window creation
* Have OS programmers provide easily accessible and visible control to invoke coordinate adjustment for all windows
* Have OS programmers provide a shortcut to invoke coordinate adjustment for all windows
* (Worst, depicted in comic): Have users rely on side-effect of properly implemented screen resolution change mechanism to fix the problem counter-intuitively.

The ''title text'' refers to the fact that two different and unrelated software packages can have confusingly similar names, even if the usage and features of those two packages can vary wildly, and knowing the implications of using one instead of the other is a case of "stupid computer knowledge". Knowing the difference between a Chrome App, a cell phone app style application, delivered from the Chrome Web Store, designed to be run in the Chrome browser, and a Chrome Extension, a browser extension installed into the Chrome browser, delivered from the chrome web store, designed to modify the behavior of the browser itself, is a subtle distinction not immediately apparent to users who may just have the name of the software they are looking for.

In many cases, Randall (or Cueball, his avatar) loves to help people using his specific knowledge (see [[208: Regular Expressions]]). But when the trick is "stupid", he would prefer the programmers to fix the problem definitively so he never has to rely on this trick anymore.

==Transcript==
:[Hairy sitting at a desk with laptop, with Cueball standing behind him.]
:Hairy: Wait, why can't I click anywhere?
:Cueball: I don't... Ugh, It opened a dialog box offscreen.
:Hairy: Why is that even ''possible?''
:Cueball: It really shouldn't be. But you can fix it by changing your screen resolution to trigger a window cleanup.
:Hairy: ''Seriously?''
:Cueball: I know, I know...

:[Caption below the frame:]
:To be honest, I can't ''wait'' for the
:day when all my stupid computer
:knowledge becomes obsolete.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Computers]]

1479: Troubleshooting

2015-01-28T19:12:15Z

108.162.221.246: /* Explanation */ Reedit for clarity and add first pass at title text explanation.

{{comic
| number = 1479
| date = January 28, 2015
| title = Troubleshooting
| image = troubleshooting.png
| titletext = "Oh, you're using their Chrome APP, not their Chrome EXTENSION. They're very similar but one handles window creation differently." is a thing I hope I can stop saying soon.
}}

==Explanation==
This comic revolves around the complexity and somewhat low quality of modern software. Many problems that users experience are not obvious or straightforward, and methods for correcting the root cause the problem requires on invoking unrelated actions that happen to cause a desired side-effect. Knowing the non-obvious cause, the desired side effect, and how to trigger the unrelated feature that causes it requires memorization of lots of "stupid computer knowledge" rather than general principles and logical investigation of the software.

One particular example of an illogical fix to a software problem is depicted in the comic. Here, [[Cueball]] is trying to help [[Hairy]] resolve the problem of a program that is not responding to any mouse clicks. Cueball (correctly?) surmises that this is not due to abnormal behavior of the software ("{{w|Hang (computing)|freezing}}"), but rather because either the user or the software itself has opened a {{w|Modal dialog|modal dialog window}} outside of the main screen area, where it can not be seen. Modal dialog windows block access to the rest of the application, by seizing the sole focus of the user input. They are valid {{w|GUI}} tools and are used when the software needs user's input before it can proceed further. However, opening such window and placing it outside of the visible screen area ("off-screen") will make the window both inaccessible and invisible to the user, precluding them from closing it and re-gaining access to the software.

One non-obvious way to repair such problem is to switch the screen resolution; Switching the resolution in itself does not fix the problem, but the resolution switch also forces the operating system to redraw all windows on the desktop and, some operating systems will also validate the coordinates of all windows and adjust these coordinates so that the windows do not end up in off-screen area. In this scenario, it is used as a side-effect to fix the problem, because operating systems rarely provide other, more obvious ways to bring the off-screen windows back to the visible area.

By saying "Why is it even possible?", Hairy is quite correct in pointing out that the best way to address this problem at its root would be for the operating system developers to prevents the creation of windows off-screen, preventing a whole class of window management problems before the can occur. Such mechanisms could validate coordinates during window creation, thus making sure that the dialog window would always be accessible and visible.

In general, one can sort the possible solutions to the problem being discussed in the following order of preference, from best to worst:
* (Best): Have OS programmers implement automatic coordinate adjustment during window creation
* Have OS programmers provide easily accessible and visible control to invoke coordinate adjustment for all windows
* Have OS programmers provide a shortcut to invoke coordinate adjustment for all windows
* (Worst, depicted in comic): Have users rely on side-effect of properly implemented screen resolution change mechanism to fix the problem counter-intuitively.

The ''title text'' refers to the fact that two different and unrelated software packages can have confusingly similar names, even if the usage and features of those two packages can vary wildly, and knowing the implications of using one instead of the other is a case of "stupid computer knowledge". Knowing the difference between a Chrome App, a cell phone app style application, delivered from the Chrome Web Store, designed to be run in the Chrome browser, and a Chrome Extension, a browser extension installed into the Chrome browser, delivered from the chrome web store, designed to modify the behavior of the browser itself, is a subtle distinction not immediately apparent to developers who are writing Chrome Web Store software.

In many cases, Randall (or Cueball, his avatar) loves to help people using his specific knowledge (see [[208: Regular Expressions]]). But when the trick is "stupid", he would prefer the programmers to fix the problem definitively so he never has to rely on this trick anymore.

==Transcript==
:[Hairy sitting at a desk with laptop, with Cueball standing behind him.]
:Hairy: Wait, why can't I click anywhere?
:Cueball: I don't... Ugh, It opened a dialog box offscreen.
:Hairy: Why is that even ''possible?''
:Cueball: It really shouldn't be. But you can fix it by changing your screen resolution to trigger a window cleanup.
:Hairy: ''Seriously?''
:Cueball: I know, I know...

:[Caption below the frame:]
:To be honest, I can't ''wait'' for the
:day when all my stupid computer
:knowledge becomes obsolete.

{{comic discussion}}
[[Category:Comics featuring Cueball]]
[[Category:Comics featuring Hairy]]
[[Category:Computers]]

Talk:1458: Small Moon

2014-12-26T17:37:03Z

108.162.221.246:

Probably another dig at the Pluto "dwarf planet" controversy?[[Special:Contributions/199.27.133.109|199.27.133.109]] 06:38, 10 December 2014 (UTC)
:Implying that it might not be? [[Special:Contributions/108.162.216.109|108.162.216.109]] 15:54, 10 December 2014 (UTC)

This is too good. I laughed for about 2 straight minutes.. :D [[Special:Contributions/199.27.128.89|199.27.128.89]] 06:50, 10 December 2014 (UTC)

Added a short placeholder explanation for the comic itself, using [[Special:Contributions/199.27.133.109|199.27.133.109]]'s suggestion. Needs refining and explaining of the alt text. Cheers. [[Special:Contributions/173.245.54.207|173.245.54.207]] 07:04, 10 December 2014 (UTC)

In the movie, they didn't have 3 hours to argue over the thing. Not sure if that's relevant... [[User:Haelbarde|Haelbarde]] ([[User talk:Haelbarde|talk]]) 07:11, 10 December 2014 (UTC)

The reason it couldn't be a space station would be that something so large would wind up collapsing in on its own gravity. [[Special:Contributions/173.245.54.204|173.245.54.204]] 08:38, 10 December 2014 (UTC)
:It's not solid, it's a comapritively low density on the whole (on the order of ten thousand million''th''s that of Earth's sea-level atmospheric pressure, if I've not thrown a rogue zero or two in to the calculation by accident, so is doubtless mostly vacuum outside of the functional/habitable/structural areas), there are obviously various gravitational compensators for the inhabited sections (hence "looking sideways out of the equator ring" and along the beam-channel, yet "up from the surface" from the trench system defence turrets and other internal shafts are also vertiginously 'up-down' in nature) and doubtless its structural stength is composed of various Unotanium (i.e. "durasteel") alloys and the like, way beyond what we could currently build with Earthly technology. [[Special:Contributions/141.101.98.245|141.101.98.245]] 10:37, 10 December 2014 (UTC)

I would note that a Death '''Star''' can not be a moon. [[User:Briff|Briff]] ([[User talk:Briff|talk]]) 10:10, 10 December 2014 (UTC)
:Note that it is canon that the "Star Destroyer"s are neither (if taken literally) capable of destroying stars nor (in the sense of "star ship" in general) are they technically destroyer-class ships. You've got to put it down to The Empire just having no sense of relevence when it comes to naming its vessels. Probably too much influence from clone-thinking... [[Special:Contributions/141.101.98.245|141.101.98.245]] 10:37, 10 December 2014 (UTC)
:I will argue that by my understanding of the term, it actually is a moon whenever it is orbiting a planet but it would probably be better to come up with new terminology given the interstellar capabilities. --[[Special:Contributions/108.162.237.183|108.162.237.183]] 12:44, 10 December 2014 (UTC)Band of Traveling Accountants

I've never heard of the word "deunifying"; did you mean "disuniting" or "disunifying"?[[Special:Contributions/173.245.54.203|173.245.54.203]] 14:09, 10 December 2014 (UTC)
:That would probably have been me who wrote that. I didn't spend too much time thinking about it, was just putting something up, fully expecting it to get fixed up later [[User:Haelbarde|Haelbarde]] ([[User talk:Haelbarde|talk]]) 00:57, 11 December 2014 (UTC)

I marked the transcript as incomplete; we can't be sure as to who is saying which lines in the final panel without Randall telling us himself. Notably, the second-to-last-line does not sound like something Ben Kenobi would say; more likely it's Han Solo. [[Special:Contributions/108.162.216.188|108.162.216.188]] 13:54, 10 December 2014 (UTC)
:Agreed. Comment is much more easily seen as coming from Solo than Kenobi. And, if they did rescue Leia during the intervening interval (one of the two scenarios suggested), Kenobi wouldn't be present. Equinox [[Special:Contributions/199.27.128.117|199.27.128.117]] 16:59, 10 December 2014 (UTC)
:I have two reasons why I'd stick with my original Luke and Ben for the last panel: 1) On a cursory read of the comic, without thinking about what would have happened in the movie, the natural assumption is they have been arguing for the entire 3 hours, so its the same two people, and 2) If they had actually been captured by the Death Star, there would no longer be any argument. They would have found upon closer inspection that it is in fact a space station. Note that in the final panel they're arguing about classifying it as a moon, as opposed to the Title Text, in which the options both acknowledge its artificial/station status.[[User:Haelbarde|Haelbarde]] ([[User talk:Haelbarde|talk]]) 00:57, 11 December 2014 (UTC)

Dear other editors: "In this galaxy" was wordplay on the {{w|Star Wars opening crawl}}. I find your lack of pop culture disturbing. Changing the phrase to "In this solar system" was incorrect. Furthermore, although the predominant civilization on Earth allows moons of nearly any size, it is not necessarily true that inhabitants of SWG followed the same nomenclature. I think the wording should be restored. - [[User:Frankie|Frankie]] ([[User talk:Frankie|talk]]) 17:42, 10 December 2014 (UTC)

:In fact, we know for sure that SWG defines "moon" differently {{w|Natural satellite|than we do}}, because when the Millennium Falcon arrived, the Death Star was not orbiting another non-star body (it was the largest body in its spatial neighborhood) and therefore could not be a moon (as defined in this galaxy). - [[User:Frankie|Frankie]] ([[User talk:Frankie|talk]]) 18:03, 10 December 2014 (UTC)

:Frankie's observation is something I thought of after seeing the movie as a kid, but the station could actually be orbiting the combined gravity of the debri field of the planet it just destroyed. The 'tidal' forces on the station would be different from the debri than from the planet, because the matter is now distributed differently, but the death star still could be an orbiting body, for a while at least. Once the debri field becomes more distributed the situation would be as Frankie stated. [[User:SeanLynch|SeanLynch]] ([[User talk:SeanLynch|talk]]) 15:54, 11 December 2014 (UTC)

I notice Randall removed the "We'll be back next week" line from his What-If page today. I wonder what's up since it's been over two weeks. [[Special:Contributions/108.162.210.241|108.162.210.241]] 02:21, 12 December 2014 (UTC)

Would it be fair to say this strip is also a reference to the fact that any object of large enough mass in space would have its own gravity? (Setting aside an earlier comment about the Death Star being mostly vacuum)

1465: xkcd Phone 2

2014-12-26T17:29:46Z

108.162.221.246: /* Explanation */ added a bit to OS by Stackoverflow

{{comic
| number = 1465
| date = December 26, 2014
| title = xkcd Phone 2
| image = xkcd_phone_2.png
| titletext = Washable, though only once.
}}

==Explanation==

This is a followup to [[1363: xkcd Phone]], which debuted the original xkcd phone. Like xkcd Phone "1", this comic parodies modern smartphone advertising with a promotional image for a fictional phone. Like the previous xkcd phone, the comic touts a variety of features which are either pointless, misleading, or physically impossible. They are clockwise, from the top left:

*'''MaxHD: Over 350 pixels per screen''': 350 pixels is not very impressive: Each would be about 0.5×0.5 cm. Even if it implies 350 pixels along the edge this is still less than standard definition TV (PAL gives 576 lines of horizontal resolution). Likely a reference to HD+, FullHD, QuadHD and other marketing expressions for screen resolutions, by which common users are often confused. In [[732: HDTV]] Randall has observered that HD is not an especially high resolution, when compared with computer monitors.
: ''Note:'' Retina display (high pixel density display) for smartphones is 326 pixels per '''''inch''''', not per '''''screen'''''.
*'''Always on Speaker''': An always on microphone is a genuine feature. It allows speech control software such as "Okay Google" or "Siri" to respond without having to be turned on. An always on speaker would be less useful especially if it implies the phone is always making noise.
*'''Blood Pressure reliever''': This appears to be where a real phone would have its front facing camera. This could imply that it's a sharp part that you can cut yourself on, thus '''''relieving''''' your blood pressure.
*'''Auto-Rotating Case:''' Phones often feature an "auto-rotating screen", meaning that the display switches between portrait and landscape mode depending on its orientation with respect to gravity. But the case is a physical part of the phone, so making a case that did '''not''' "auto-rotate" with the phone would be the real challenge.
*'''Ribbed:''' A reference to ribbed {{w|condom}}s, which are often advertised as superior to standard ones. Some other objects can be advertised with the word ribbed as well, but mostly in the context where it allows a firmer grip on the device when wet. Since phones are usually not meant to be used wet it is still a fairly useless feature.
*'''Waterproof (inside only)''': Waterproofing is done to the outside to prevent water from getting in, not to prevent water from escaping.
*'''Googleable''': Another non-feature. Advertising as ...able is a way for marketing to add features, without adding features. This may be (for example) a recyclable paper bag: paper is normally recyclable. Any term may be 'googled' so being "googleable" is not an actual feature.
*'''Cheek toucher''': The screen will touch your cheek when making a hand-held phone call.
*'''Cries if lost:''' Actually useful function, for it would help the owner find the cellphone in case it was lost. It refers to people's habit of calling their own cellphones to help find it. It also resembles the first xkcd phone's functions of 'Screaming when falling' and 'Saying hi when lit'.
*'''Bug drawer:''' This is most likely the cover for other ports, though looks like a small drawer, capable of only holding bug-sized items. Possibly a joke on software bugs, which would, being virtual rather than physical, easily fit inside this area. This would then also be through here you might introduce bugs to your phone. May also be a reference to "Phone may attract/trap insects; this is normal" from the original ''xkcd Phone'' comic.
*'''Coin slot:''' In most phones, this would be the charging port. Payphones have coin slots.
*'''Scroll lock:''' A computer key on most keyboards which is practically never used. (Despite [http://www.explainxkcd.com/wiki/index.php/978 a previous xkcd strip] it was not invented by {{w|Steven Chu}}.)
*'''OS by Stackoverflow®:''' [http://stackoverflow.com/ Stackoverflow.com] is a very useful and popular question/answer forum for programmers, and many recent software products probably have benefited from advice given there, so Randall may be giving credit where credit really is due. Or it may be a reference to the rampant problem of code reuse, where programmers use the pre-written code on StackOverflow rather than writing their own, regardless of the fact that the code on StackOverflow may contain bugs or otherwise cause problems for their specific program.
*'''3D Materials:''' All real materials are three-dimensional, thus not an actual feature.
*'''Dog Noticer''': Does this alert the user to nearby dogs, or does it produce dog control notices and orders?
*'''FitBit® Fitness Evaluator''': {{w|FitBit}} make wristbands that measure heartrate and as an aid to planning an exercise programme.
*'''Volume and density control:''' A play on words between {{w|volume (disambiguation)|volume}} as in speaker loudness, and {{w|volume}} as in a physical property inversely related to {{w|density}}. Apparently this would allow the user to change the size of the phone (which would indeed be a very useful feature), thus changing the volume and the density. Note that some computer mice have a feature where the user can put weights inside the case to customise the weight and thus affect the density in a different way.
*'''It is washable but only once''' (the title text): Only once as washing it will ruin it!

==Transcript==
:[An image of a smartphone. Coming off from it are many labels. Clockwise, from the top left they are:]
:MaxHD: Over 350 pixels per screen
:Always-on speaker
:Blood pressure reliever
:Auto-rotating case
:Ribbed
:Waterproof (interior only)
:Googleable
:Cheek toucher
:Cries if lost
:Bug drawer
:Coin slot
:Scroll lock
:OS by Stackoverflow®
:3D materials
:Dog noticer
:FitBit® fitness evaluator
:Volume and density control

:[Below the phone:]
:Introducing
:'''The xkcd phone 2'''
:A phone for your other hand®

{{comic discussion}}

1462: Blind Trials

2014-12-21T10:51:16Z

108.162.221.246: Two words were mistakenly swapped in transcript

{{comic
| number = 1462
| date = December 19, 2014
| title = Blind Trials
| image = blind_trials.png
| titletext = Plus, you have to control for the fact that some people are into being blindfolded.
}}

==Explanation==
In research, a {{w|Blind Experiment|blind trial}} is an experiment where certain information about the test is concealed from the subjects and/or the testers, in order to reduce sources of bias in the results. A scientific approach requires the use of {{w|control groups}} to determine the significance of observations in (clinical) trials. The members of the control group receive either no treatment or the "standard" treatment. A double-blind trial is one where neither the subject nor the testers know who has received treatment, or who is in the control group.

Controls and blinding are crucial to distinguish the actual effects of the treatment from the {{w|placebo effect}}. A subject's belief in whether or not a treatment will help them can cause measurable physiological changes, good or bad. It is vital that there are no clues available to distinguish between the different groups. Even subtle cues from the body language of the testers are sufficient to trigger placebo effect, making double-blind trials necessary.

In a clinical drugs trial, the most common method of blinding is to give the control group a sugar pill with no medicinal value, but identical in appearance to the actual medicine.

Challenges exist in designing placebo alternatives to certain physical treatments that might be being tested, such as acupuncture; in this case the best quality trials have typically used either special 'joke' retractable needles that only give the illusion of proper penetration or the practitioner/researcher deliberately and safely avoids the traditional {{w|Meridian_(Chinese_medicine)|meridians}} on the body for the treatment concerned so that the patient remains 'blind' to their role in the trial (the practitioner must otherwise be consistent in treatment between groups and not be involved in the medical assessment phase for properly double-blinded conditions), where the most reliable results still seem to only show a significant placebo effect at work.

There are, however, certain cases where it is almost impossible to make the experience of the control group identical to that of the test group. While making a real and fake pill appear the same is a relatively trivial task, and though depending upon the ignorance of participants to the details of a given established practice or procedure can allow for a certain level of reliability in results, it would be challenging (to say the least) to make the control group in the described experiment think that they are having lots of sex, when in fact they are just taking a sugar pill.

Scientific research involving humans is extremely challenging to conduct because of the difficulty in finding appropriate control groups. This is one of the reasons animal experiments (for instance involving inbred strains of mice) are so common.

The title text adds another twist by taking “blind” literally, and noting that for some people, being blindfolded increases their enjoyment of sexual activity.

==Transcript==
:[Megan is pointing at charts hanging on the wall.]
:Megan: We've designed a double-blind trial to test the effect of sexual activity on cardiovascular health.
:Both groups will ''think'' they're having lots of sex, but one group will actually be getting sugar pills.

:[Caption reads]
:The limitations of blind trials

{{comic discussion}}