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In popular music, a supergroup is a musical group formed by collaboration of existing solo artists and members of other musical groups. This comic shows a marquee announcing a concert by a supergroup formed from members of 10 musical groups whose names all begin with a number. The name of the supergroup is the sum of all those numbers, , followed by the names of the original groups without their numbers. It's reasonable to estimate that there could be up to 32 members of the supergroup see below. The title text indicates that this supergroup performs a medley or mashup of songs whose titles begin with numbers. The title of this "supersong" is similarly formed by adding the numbers and following with the rest of all the titles. Notably, none of the referenced songs were written by any of the referenced artists.

Xkcd.com

The subject matter of the comic varies from statements on life and love to mathematical , programming , and scientific in-jokes. Some strips feature simple humor or pop-culture references. It has a cast of stick figures , [3] [4] and the comic occasionally features landscapes, graphs, charts , and intricate mathematical patterns such as fractals. Munroe has released five spinoff books from the comic. The first book, published in and entitled xkcd: volume 0 , was a series of select comics from his website. His book What If? His book Thing Explainer explains scientific concepts using only the one thousand most commonly used words in English. As a student, Munroe often drew charts, maps, and "stick figure battles" in the margins of his school notebooks, besides solving mathematical problems unrelated to his classes. By the time he graduated from college, Munroe's "piles of notebooks" became too large and he started scanning the images. According to Munroe, the comic's name has no particular significance and is simply a four-letter word without a phonetic pronunciation, something he describes as "a treasured and carefully guarded point in the space of four-character strings ". In January , the comic was split off into its own website, created in collaboration with Derek Radtke. In May , the comic garnered widespread attention by depicting online communities in geographic form. Various websites were drawn as continents, each sized according to their relative popularity and located according to their general subject matter. On September 19, , "Click and Drag" was published, which featured a panel which can be explored via clicking and dragging its insides.

Retrieved December 30, Title text: I love their cover of 1, Balloons, xkcd.com, Dalmatians, and Miles.

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The seventh What If? No matter how fast you push something, it will never quite get up to light speed. Our universe has some weird rules. But the closer something gets to the speed of light, the more energy and momentum it has—and this energy and momentum go up without limit. As it falls, it compresses the air in front of it. When the air is compressed, it heats it up. This is the same thing that heats up spacecraft and meteors—actual air friction has little to do with that. When it hits the ground, two minutes after it was released, it makes a crater meters across—the size of a school, shattering into fragments in the process. If we set the diamond in space a little ways away from the Earth, and let it fall toward us, it will hit at about 11 kilometers per second. At 11 kilometers per second, the brief descent would be visible as a fireball.

Xkcd.com

In this comic, White Hat suggests creating a meta-metric, "number-of-metrics-that-have-become-targets," and making it a target. First, Cueball introduces and defines Goodhart's Law , which is the observation that when a metric — a measure of performance — becomes a goal, efforts will be unhelpfully directed to improving that metric at the expense of systemic objectives. For example, imagine a scenario in which a car dealership is looking to grow profits, and its managers decide to focus on increasing a component metric of profit: how many cars it sells.

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End of that query, at least. September ; 18 years ago [1]. Retrieved February 10, Huffington Post. Archived from the original on November 19, Archived from the original on October 13, Archived from the original on March 26, Munroe contributed a story titled "? Astronauts would theoretically land on the Moon, but the hypothetical fragments of the Moon would make the landing impractical. Nearly all xkcd strips have a tooltip , the text of which usually contains a secondary punchline or annotation related to that day's comic. Archived from the original on March 25,

The seventh What If? There are a lot of problems with the concept of a single random soul mate.

Lunar Orbit Rendezvous LOR Description: Using a single large rocket to get the required lunar orbiter and lander systems into trans-lunar orbit, which can then fulfil their eponymous roles. Retrieved August 19, Archived from the original on December 21, Retrieved October 10, Some strips feature simple humor or pop-culture references. Retrieved August 5, It would have allowed almost arbitrarily large sizes of equipment to have reached the surface, perhaps to simplify the return journey, but with the complication of adding multiple orbital docking procedures to the project rather than most assembling and spacecraft mating being carried out prior to launch. This would be also bad for the Earth's climate, tides, stock markets and ecosystems. Archived from the original on October 1, Archived from the original on January 10, Archived from the original on August 26, This comic shows a marquee announcing a concert by a supergroup formed from members of 10 musical groups whose names all begin with a number. Nearly all xkcd strips have a tooltip , the text of which usually contains a secondary punchline or annotation related to that day's comic. Archived from the original on April 14, Status: Rejected for requiring an unreasonably large rocket.