Xkcd

xkcd, sometimes styled XKCD, is a webcomic created by Randall Munroe. The comic's tagline describes it as a "A webcomic of romance, sarcasm, math, and language". Munroe states on the comic's website that the name of the comic is not an acronym but "just a word with no phonetic pronunciation".

The subject matter of the comic varies from statements on life and love to mathematical and scientific in-jokes. Some strips feature simple humor or pop-culture references. Although it has a cast of stick figures, the comic occasionally features landscapes, intricate mathematical patterns such as fractals (for example, comic No. 17 – "What If" shows an Apollonian gasket), graphs and charts, or imitations of the style of other cartoonists (such as during "Parody Week").

xkcd is available under the Creative Commons Attribution-NonCommercial 2.5 License. New comics are added three times a week, on Mondays, Wednesdays, and Fridays, although on some occasions they have been added every weekday.

From July 2012 to September 2015, there was a branch of xkcd titled What If?, which answered reader-submitted unusual science questions in a light-hearted but scientifically grounded way. What If? was presented in the format of an article rather than a comic strip. On March 12, 2014, a book was announced containing new and expanded questions titled What If?: Serious Scientific Answers to Absurd Hypothetical Questions. The book came out on September 2, 2014 and on September 10, 2014, it became number one on the New York Times nonfiction hardcover best-seller list. On May 13, 2015, Randall Munroe announced another new book, Thing Explainer, based on comic No. 1133 – "Up Goer Five". Thing Explainer "is full of detailed diagrams of interesting objects, along with explanations of what all the parts are and how they work". Most notably, the diagrams and explanations use only the one thousand most commonly used words in English. Thing Explainer was released on November 24, 2015.

https://en.wikipedia.org/wiki/Xkcd