Explain xkcd: It's 'cause you're dumb.
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|| This explanation may be incomplete or incorrect: Some paragraphs are missing so that it becomes as long as the other explanations.|
Ponytail continues Cueball's medical checkup with a genetic test.
Genetic tests show people congenital diseases that they might be at risk for and give them insight into their ancestry. In this case, the genetic results are extremely obvious: His genes are part of a long line of genes stretching back to
the first organism on Earth one of the earliest forms of life on Earth.
||the simplest forms of life could have evolved multiple times before some of them managed to survive for enough generations to give rise to everything on the planet today.
This information is, of course, useless for medical purposes.
This comic is similar to the previous one, as in both comics a doctor tells a patient something that is true for all living human beings. In fact, the drawing is extremely similar to Panel 1 of the previous comic.
A similar joke was made in the title text of #674: Natural Parenting: "On one hand, every single one of my ancestors going back billions of years has managed to figure [having kids] out. On the other hand, that's the mother of all sampling biases."
In epidemiology, a risk factor is a variable associated with an increased risk of disease or infection. The title text says that this is a risk factor because being a living human being is, trivially, associated with every disease that could possibly afflict human beings.
- [Cueball is seated on an medical examination table while Ponytail stands dressed in a doctor's coat holding a file in her right hand.]
- Ponytail: Your genetic test results are back. Apparently you're part of an unbroken lineage stretching back billions of years to the early Earth!
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