Main Page

Explain xkcd: It's 'cause you're dumb.
Jump to: navigation, search

Welcome to the explain xkcd wiki!
We have an explanation for all 1892 xkcd comics, and only 27 (1%) are incomplete. Help us finish them!

Latest comic

Go to this comic explanation

Since the current Twitter threadfall kicked off in early 2016, we can expect it to continue until the mid-2060s when the next Interval begins.
Title text: Since the current Twitter threadfall kicked off in early 2016, we can expect it to continue until the mid-2060s when the next Interval begins.


Ambox notice.png This explanation may be incomplete or incorrect: Needs more. Do not delete this tag before the explanation is actually complete.

F'nor is a character from the popular sci-fi/fantasy series Dragonriders of Pern by Anne McCaffrey. He is posting a Twitter comment (a "thread" that's only one comment long, hence "1/1") about "Thread", a massively destructive alien organism from the same series. Pern is a fictional human-colonized planet and the main setting of the series.

Typically, when starting a series of tweets (used to post content longer than 140 characters), one will start the first tweet with "Thread: " and end it with 1/X. The second tweet will read 2/X, and so on. If X, the total number of tweets, is unknown at the start, it will be listed or 1/many or omitted: 1/

Here, there is a play on the Twitter thread and the actual threat to Pern.

The title text mentions "Threadfall" which is the name for the beginning of 50-year cyclic periods when Thread attacks the world of Pern and its inhabitants, which occur between relatively safe "Intervals" of around 200 years. The title text states that since Threadfall occurred in 2016, it should be expected to continue for ~50 more years until the mid-2060s, when the next Interval will begin.


[A mock-up of a “tweet” from the site is shown. It contains a mock-up of a user photo of the fictional character F’nor that resembles Hairy, including a tiny line sketch of F’nor’s brown dragon Canth flying overhead. Below the tweet are several action buttons typical of a Twitter post for comments, replying, likes, etc.]
Thread: The greatest threat to our life on Pern 1/1


On Friday, the header was replaced with a message from Randall about how he would be visiting the U.K. on the following week. It read as follows:

 I'll be visiting the UK next week! You can join me in London from September 30-October 2 (at New Scientist Live, The Royal Institution, and Intelligence Squared), then from October 3-6 in York, Edinburgh, Cambridge and Ely, Oxford, and Cheltenham.

Is this out of date? Clicking here will fix that.

New here?

Last 7 days (Top 10)

Lots of people contribute to make this wiki a success. Many of the recent contributors, listed above, have just joined. You can do it too! Create your account here.

You can read a brief introduction about this wiki at explain xkcd. Feel free to sign up for an account and contribute to the wiki! We need explanations for comics, characters, themes and everything in between. If it is referenced in an xkcd web comic, it should be here.

  • There are incomplete explanations listed here. Feel free to help out by expanding them!
  • We sell advertising space to pay for our server costs. To learn more, go here.


Don't be a jerk.

There are a lot of comics that don't have set-in-stone explanations; feel free to put multiple interpretations in the wiki page for each comic.

If you want to talk about a specific comic, use its discussion page.

Please only submit material directly related to (and helping everyone better understand) xkcd... and of course only submit material that can legally be posted (and freely edited). Off-topic or other inappropriate content is subject to removal or modification at admin discretion, and users who repeatedly post such content will be blocked.

If you need assistance from an admin, post a message to the Admin requests board.

Personal tools


It seems you are using noscript, which is stopping our project wonderful ads from working. Explain xkcd uses ads to pay for bandwidth, and we manually approve all our advertisers, and our ads are restricted to unobtrusive images and slow animated GIFs. If you found this site helpful, please consider whitelisting us.

Want to advertise with us, or donate to us with Paypal?