2501: Average Familiarity

Explain xkcd: It's 'cause you're dumb.
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Average Familiarity
"How could anyone consider themselves a well-rounded adult without a basic understanding of silicate geochemistry? Silicates are everywhere! It's hard to throw a rock without throwing one!"
Title text: "How could anyone consider themselves a well-rounded adult without a basic understanding of silicate geochemistry? Silicates are everywhere! It's hard to throw a rock without throwing one!"

Explanation

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This comic claims that scientists vastly overestimate how familiar other people are with their own field of study. As an example, Randall shows a pair of geologists specializing in silicate chemistry. The scientists are under the impression other people at least know the chemical makeup of feldspar and quartz. In truth, the "average Joe" can't be expected to know the chemical makeup of anything reliably, and may not even know the definition of "feldspar" beyond "a rock".

The title text plays on the term "you can't throw a rock without hitting one," a common hyperbole about how common something is. Indeed, silicate rocks are extremely common on Earth.

Transcript