1839: Doctor Visit

Explain xkcd: It's 'cause you're dumb.
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Doctor Visit
According to these blood tests, you're like 30% cereal.
Title text: According to these blood tests, you're like 30% cereal.


Ambox notice.png This explanation may be incomplete or incorrect: Created by a BOT - Edited by a human. Needs more humans.
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Cueball is visiting his doctor Ponytail, apparently for a general medical checkup.

While there is nothing wrong with him medically, the doctor wonders why he has continued to work for many years despite his body parts' individual fragility. Compared to man-made structures - like the USB cables mentioned by Ponytail, which quickly begin to fray - it's surprising that the body can survive for so long while sustaining so much wear and tear. Actually the body gets stronger and more fit the more it is used, as opposed to USB cables.

Ponytail specifically mentions his eyes which are so fragile and exposed. Yet most people go through a whole life with both eyes intact, although the vision itself may be impaired. The human reflexes and the shape of the skull around the eyes has a lot to do with the fact that it is possible to protect such fragile structures for a lifetime.

Ponytail also remarks that the body is composed of high pressure fluids (particularly blood, intracellular and extracellular fluids)and intricate parts (like the nervous system and the heart). If the fluids stopped flowing or the intricate parts stopped working, the entire body would fail, killing Cueball.

It should be noted that the human body is constantly replacing dead/injured cells and needs a constant supply of energy and nutrients to keep this process going. USB cables, while apparently tougher than blood vessels on first inspection, have no such repair mechanism.

The doctor's final remark is that Cueball is mainly made from dissolved bread, which is true from the perspective that the food (bread) he eats is digested in his alimentary system, absorbed into his bloodstream and used as nutrients for growth and repair.

This is taken further in the title text, where she states that the blood tests reveal he is 30% cereal.


  • This comic treats the human body as if it were a machine, remarking on its extraordinary capacity to survive wear and tear. The previous comic was about machine learning, which is a step in automating tasks that are usually done by humans. (Perhaps Randall is musing about how difficult it would be to create a machine that can function as well as a human can?)


This is a four panel comic, where the lead protagonist (Cueball) has gone to his doctor(Ponytail) for a health checkup. Cueball is seated on an examination table while Ponytail is standing dressed in a white coat and has a file in her right hand.

Cueball: Everything look good?

Ponytail: I don't get how your body has been moving around for years and still works at all. My USB cables fray after like a month.

Ponytail: Your heart has been pumping for decades without pausing for even a few minutes. And your EYES! They're so fragile and exposed!

Ponytail: You're full of all these high-pressure fluids and intricate parts that could kill you in seconds if they stopped working!

Cueball: (Elbows flexed with upward palms almost in a begging gesture) ...Can you just tell whether I'm healthy?

Ponytail: Yeah, you're fine. Which is weird, given that your body is basically made from dissolved bread.

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This comic seems relatively simpler to explain. Nialpxe (talk) 06:38, 19 May 2017 (UTC)

I don't have the desire to edit this at the moment. However, it should be mentioned that when studied and considered critically the human body is actually quite resilient. We are merely used to thinking of "strong" and "tough" as properties of metal, which to someone unfamiliar with the materials which make up Human organs may associate them as being squishy and therefore weak. The human eye itself is perhaps vulnerable as it is a delicate instrument but it is not weak. Moreover the human body is self-renewing and of a far higher quality of function and design than any technology we have created. --Lackadaisical (talk) 13:16, 19 May 2017 (UTC)

Anyone who thinks metals are strong and tough should talk with dentists about length of warranty on dental crowns. But yes, the main advantage of human body is the self-repair capability. (Note that I have cables which works for years, but maybe I don't manipulate them so often.) -- Hkmaly (talk) 22:41, 19 May 2017 (UTC)
30% Cereal

Am I the only one who doesn't get that one? 10:08, 19 May 2017 (UTC)

I'm pretty sure the 30% cereal is a reference that the human body is made of 70% of water. 10:46, 19 May 2017 (UTC)

But blood has around 90% of water. Can a blood test tell how much water Cueball has ? (talk) (please sign your comments with ~~~~)

This possibly has to do with the fact that numerous things produced by the body, such as hair, are partly produced from consumed high fructose corn syrup which is found in cereal and countless other foods as a sweetener. [citation needed] 12:37, 19 May 2017 (UTC)

I always thought that HFCS tasted like hair. Now I know what it's made of! *spits out beverage* (Just kidding. They don't use HFCS in my country.) Nialpxe (talk) 12:48, 19 May 2017 (UTC)

It seems that Randall recently read the book "Antifragile" by N. Taleb :) (talk) (please sign your comments with ~~~~)

I think it refers to that 70% of a human is water, I guess. 13:39, 19 May 2017 (UTC)

That kinda reminds me of those Code quality strips. The overall tone in all of those is "How did you manage to get it working?!" 14:36, 19 May 2017 (UTC)

I was reading the 30% cereal comment as a play on the 'you are what you eat' idea. Three meals per day plus some snacks would make breakfast (cereal) about 30% of the diet. 15:28, 19 May 2017 (UTC)

I think this strip makes a lot more sense if you replace Ponytail with Zoidburg. 19:44, 19 May 2017 (UTC)

Am I the only one that thought "bread" referred to carbohydrates, and everything they break down into? 04:22, 20 May 2017 (UTC)

Anyone else think this has to do with Trump's latest stupid comment about the body having finite energy like a battery and it being a bad idea to exercise? 05:33, 22 May 2017 (UTC)

I thought that too, about the "finite amount of energy" comment from djt, but Randall mostly seems to avoid political commentary. PocketBrain (talk) 12:39, 22 May 2017 (UTC)

Am I the only one that thinks that Ponytail might not be human - Referencing "my USB cables" bring part of herself that she needs to replace regularly from carrying out normal human activities? This would also explain her surprise at how the human body functions 16:25, 22 May 2017 (UTC)

You might be - in all honesty, I frequently think these same kinds of thoughts myself, and this may just be Randall's way of presenting them to us. I don't believe this has anything to do with aliens or possession. Just my $0.02 --Ianrbibtitlht (talk) 22:13, 9 June 2017 (UTC)

You know what we need? Biological self healing USB cables. Problem solved. 14:05, 23 May 2017 (UTC)

You would have to feed them and clean up their excrement - that's trading one problem for two. On second thought, they could be plant based. -- (talk) (please sign your comments with ~~~~)

They should definitely be plant based - we don't want them to move on their own. Still, keeping them on sun often enough and watering them would be easy to forget. Also, plants are not really good at conductivity ... but we could have biological optical cables. Or have normal cables and only use plant-based isolation on them - that should still make them last considerably longer. -- Hkmaly (talk) 03:14, 27 May 2017 (UTC)