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Nearly all xkcd strips have a tooltip when hovering over the comic, known as a title text. It usually contains an addition or expansion of the joke in the main comic, or an explanation of the joke in very early comics.

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xkcd. 499,885 likes · 19,583 talking about this. A webcomic of romance, sarcasm, math, and language.

r/xkcd: /r/xkcd is the subreddit for the popular webcomic xkcd by Randall Munroe. Come to discuss the comics and other work by Randall with other…

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Originally developed to moderate one of Munroe's xkcd -related Internet Relay Chat (IRC) channels, the software's algorithm attempts to prevent repetition in IRC channels by temporarily muting users who send messages that are identical to a message that has been sent to the channel before.

What If? The Video Series is the official adaptation of the 'What If?' books by Randall Munroe (xkcd.com) and is produced by Neptune Studios LLC