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Explanation
The Joke
This is not a traditional comic but a promotional announcement. The text reads: "For one afternoon only, the Weinersmiths are commandeering the Barnes and Noble Instagram account to promote our new book and answer your questions about space settlement. Click this image to go see." Kelly and Zach Weinersmith are depicted, with one of them saying: "Ask us anything, especially if it's gross!"
Context
This is a promotional image for the Weinersmiths' book "A City on Mars" (2023), which examines the feasibility and challenges of human space settlement. Zach Weinersmith (the creator of SMBC) and Kelly Weinersmith (a parasitologist and science writer) co-authored the book, which takes a skeptical look at plans to colonize Mars and other celestial bodies.
The "click it" banner at the top is SMBC's standard indicator for the votey/bonus panel, repurposed here as a call to action for the Instagram takeover. The humor in "especially if it's gross" is characteristic of the Weinersmiths' approachable, irreverent communication style — Kelly's background in parasitology means she is genuinely enthusiastic about the grosser aspects of biology.
Broader Context
SMBC occasionally features promotional comics or announcements in place of regular strips, particularly around book launches. "A City on Mars" was published in November 2023, and this comic appeared during the pre-release promotional period. The Barnes and Noble Instagram takeover was part of the book's marketing campaign.