765: Dilution

Explain xkcd: It's 'cause you're dumb.
Jump to: navigation, search
Dilution
Dear editors of Homeopathy Monthly: I have two small corrections for your July issue. One, it's spelled "echinacea", and two, homeopathic medicines are no better than placebos and your entire magazine is a sham.
Title text: Dear editors of Homeopathy Monthly: I have two small corrections for your July issue. One, it's spelled "echinacea", and two, homeopathic medicines are no better than placebos and your entire magazine is a sham.

Explanation

Homeopathy is the belief that poisons, bacteria, and other harmful substances can actually cure the diseases they normally cause, if they are administered in sufficiently dilute form. The normal procedure is to prepare a solution, then successively dilute it with water or alcohol by multiple factors of 10 and shake it. In the medical world, it's known to be completely ineffective, with countless scientific studies repeatedly showing it to have no more effectiveness than a placebo. Keep in mind that homeopathy was invented when standard treatments included blood letting, drugs made with mercury and arsenic, and natural remedies made with nightshade and hemlock. So doing effectively nothing like homeopathy had better results than doing harm to an individual.

Here we find Cueball, a firm believer in homeopathy, applying the idea to fertility by diluting his semen. 30X means that the semen has been diluted with water at a 1:10 ratio 30 times, so the solution contains 1 part semen to one-nonillion (1,000,000,000,000,000,000,000,000,000,000) parts water. Since the average ejaculation contains 200 to 500 million sperm cells, this means the solution Cueball is holding has a 3.5x10-20% chance of containing even a single sperm cell. Clearly, Megan will not be getting pregnant from this, so she and Cueball will not be passing on their genes to the next generation, which is why the comic states that "the belief in homeopathy is not, evolutionarily, selected for".

According to the belief of homeopathy, diluted sperm should not help in getting pregnant, but help to cure the symptoms, e.g. pregnancy, caused by it[actual citation needed]. So even if diluting it 30X, would have a homeopathic effect, it would be the opposite of the one Cueball states he wants to achieve.

Echinacea is a genus of flowers commonly used in herbal remedies to stimulate the immune system. Scientific studies have not shown that such an effect exists. The title text is intended to represent a letter to the editors of fictitious journal 'Homeopathy Monthly', starting with a minor complaint that they seem unable to perform the basic proof-reading and fact-checking necessary to correctly spell one of the most well-known herbal remedies. This is followed up by a complete dismissal of homeopathy as a whole and the magazine in particular.

Transcript

[Cueball stands at a desk with a beaker in one hand and a turkey baster in the other. Megan lies in a bed in the same room.]
Cueball: Okay, this time I've diluted the semen 30x.
Megan: We'll be sure to get pregnant now!
Belief in homeopathy is not, evolutionarily, selected for.

comment.png  Add comment      new topic.png  Create topic (use sparingly)     refresh discuss.png  Refresh 

Discussion

Technically, however, homeopathy states that diluted semen should act as a contraceptive. To get pregnant, they would have to dilute a birth-control pill or something. 134.94.171.148 (talk) (please sign your comments with ~~~~)

I remember someone complaining that homeopathic medicines are labeled similarly to the real thing on drug store shelves. Wouldn't this mean that, at least in some interpretations, it's the medicine which can be diluted into a cure?173.245.52.135 17:47, 13 April 2014 (UTC)
No, the previous user is correct. The "theory" of homeopathy is that to cure a symptom you provide something that would cause that symptom diluted into some ridiculously small dose. Any products that are marketed with the label "homeopathy" but are primarily an active ingredient that would have a detectable effect are using the label incorrectly. For example, there are two kinds of zinc in Zicam, both diluted at 2x, which means they're 1% of their original solution strength. The label doesn't indicate the original solution strength and doesn't indicate how much zinc is actually present in the medicine. Zinc is known to improve the immune system, so taking a diluted zinc supplement to stop a cold would, if homeopathy were true, would be the opposite of what you'd want to do. Contrast this with the homeopathic remedy Belladonna, prepared at 30X concentrations (preparation is 1x10^-30 of original concentration) supposedly cures the circulatory system, because in normal concentrations Belladonna causes tachycardia, among other things. Ioldanach (talk) 14:16, 17 September 2014 (UTC)
Any marks for realising why scientists can't replicate homeopathy's results? :)) I used Google News BEFORE it was clickbait (talk) 21:40, 26 January 2015 (UTC)
Maybe Cueball is Sterile?108.162.215.89 00:07, 17 May 2015 (UTC)

Can we conclude that the woman is Megan? 67.188.195.182 21:32, 5 September 2013 (UTC)

The woman is in fact Megan, I did edit the transcript.--Dgbrt (talk) 22:38, 5 September 2013 (UTC)

I found this explanation of the wording helped: "Traits that cause greater reproductive success of an organism are said to be selected for, whereas those that reduce success are selected against." (From http://en.m.wikipedia.org/wiki/Natural_selection) --Insomniac (talk) 05:59, 26 September 2013 (UTC)

I find it more likely that the female is Danish, as she has longer hair.--Forrest (talk)09:41, 25 August 2015 (UTC)

Except Danish is actually smart. 172.68.34.106 20:21, 30 May 2018 (UTC)

I wrote out 1 nonillion, because #1162 also applies to quitters who don't have enough text space to make their point properly. International Space Station (talk) 23:26, 18 December 2015 (UTC)

You still used a log scale. That’s approximatwly what place-value system is, as was pointed out in a few What-Ifs. There has not been enough hard drive space yet manufactured to make your point properly (assuming at least one bit per part water). --162.158.74.171 02:50, 16 June 2017 (UTC)

I like homeopathy, and enjoy talking to its proponents. I find it incredibly entertaining. 108.162.245.106 20:51, 15 May 2016 (UTC)

If Semen is mixed long enough with water, especially in lower temperatures (below body heat), sperm will break down and die. So even if cueball got that 1 nonilionth chance of having a sperm cell in there, it would be long dead by now. 162.158.62.63 03:30, 2 February 2021 (UTC)

"Homeopathy is the belief that poisons, bacteria, and other harmful substances can actually cure the diseases they normally cause, if they are administered in sufficiently dilute form." Isn't that kind of like a vaccination? (I'm just ragebaiting!)172.71.164.38

From chatgpt:
Homeopathy is based on two main principles: "like cures like" (substances that cause symptoms in healthy people can treat similar symptoms in sick people) and "law of infinitesimals" (the more diluted a substance is, the more potent it becomes). Homeopathic remedies are typically diluted to such an extreme degree that no molecules of the original substance remain in the final preparation.
Vaccines, on the other hand, work by exposing the immune system to weakened or inactive parts of a pathogen (or synthetic analogs), triggering the production of antibodies and memory cells. This creates immunity without causing the disease. Importantly:
Vaccines contain measurable amounts of antigen material that directly stimulate the immune system
The biological mechanism of vaccines is well-understood and demonstrable
Vaccines have been rigorously tested in clinical trials showing their effectiveness
While both approaches might superficially appear to follow a "like treats like" philosophy, vaccines have a clear biological mechanism supported by extensive scientific evidence, whereas homeopathy's proposed mechanisms (like "water memory") contradict established principles of chemistry and physics. --FaviFake (talk) 16:42, 17 April 2025 (UTC)
I wasn't going to bother to reply to the ragebaiting, but now I want to say that you don't need to "ask chatgpt" (and, frankly, I still don't trust it to not hallucinate or get the wrong end of the wrong stick) to know that even if you get any of the "like" (to "cure like"), at the dilution ratios used (which is just part of the problem), vaccinations generally aren't used as direct counter to the thing being vaccinated ("you have dangerous bugs, here have some more dangerous bugs, they'll fight it out, because of... something that's mystical woo-woo") but as a more controlled and controllable 'training scenario'. Ideally before you catch the bad-bugs, you do the equivalent of throwing a few representative enemies over the city walls (dead, dismembered, tied up or even in the form of a shop manequin dressed in the enemy uniform) with a sign hanging from them saying "Beware, these enemies might be attacking shortly!"⅔...
Homeopathy is like sending in vague rumours of what the enemy looks like (maybe "Wanted" posters with questionmarks where a mugshot should be), even while the the real ones are busy rampaging and pillaging through your city. 162.158.216.82 20:01, 17 April 2025 (UTC)
      comment.png  Add comment