ABCD
Transit of Mercury

For some reason the water in my pool is green and there's a weird film on the surface #nofilter
Recombination And Reionization

These signals seem to be pre-star-formation but post-Malone.
Voting Referendum

The weirdest quirk of the Borda count is that Jean-Charles de Borda automatically gets one point; luckily this has no consequences except in cases of extremely low turnout.
Software Updates

Everything is a cloud application; the ping times just vary a lot.
Screen Time

These new Bluetooth socks are great, but it's troubling to learn that I average almost 14 hours of Shoe Time a day.
Terminator: Dark Fate

I was sent here to stop the robot that was sent here to protect the human who was sent here to protect the human who was sent here to destroy the robot that was sent here to vacuum the floor.
Emulation

I laugh at the software as if I'm 100% confident that it's 2019.
Imagine Going Back in Time

I wonder what the trendy adults in 2019 who are too cool for Pokemon will be into. Probably Digimon!
Earthquake Early Warnings

I was fired by the National Weather Service five minutes after they hired me for going into their code base and renaming all the tornado warnings to "tornado spoiler alerts."
Wardrobe

If you'd just agree to hold your meetings in here, you'd have PLENTY of time to figure things out before the deadline.
53 Cards

Well, there's one right here at the bottom, where it says "53."
Percent Milkfat

"So what's dark energy?" "Cosmologists and the FDA are both trying very hard to find out."
Faculty:Student Ratio

They managed to briefly hit the top of the rankings when they rejected everyone except one applicant, published 5 billion research papers that just said "Hi," and hired one of their graduates for $50 trillion/year (then fired them after 10 microseconds.)
Chemistry Nobel

Most chemists thought the lanthanides and actinides could be inserted in the sixth and seventh rows, but no, they're just floating down at the bottom with lots more undiscovered elements all around them.
How Old
![We've met! I remember you when you were thiiiis tall! [*holds a hand an inch above their head*]](https://imgs.xkcd.com/comics/how_old.png)
We've met! I remember you when you were thiiiis tall! [*holds a hand an inch above their head*]
Cell Phone Functions

... tazer ... fire extinguisher ... bird feeder ... toilet paper ...
Hours Before Departure

They could afford to cut it close because they all had Global Entry.
College Athletes

Their signature play is the three-point combinator, a recursive offense which is guaranteed not to halt and continues accumulating points until the buzzer.
Fresh Pears

I want to sell apples but I'm still working on getting the machine to do the cutting and grafting.
Drone Fishing

Today's consumers who order their drones off the internet don't know the joy of going out in nature and returning with a drone that you caught yourself, whose angry owners you fought off with your own two hands.
Math Work

I could type this into a solver, which MIGHT help, but would also mean I have to get a lot of parentheses right...
Mavis Beacon

There are actually lowercase-like 'oldstyle' forms of normal numbers with more pronounced ascenders and descenders, which is why some numbers like '5' in books sometimes dangle below the line. But the true capital numbers remain the domain of number maven Mavis Beacon.
Types of Approximation

It's not my fault I haven't had a chance to measure the curvature of this particular universe.
Ksp 2

"The committee appreciates that your 2020 launch is on track, but the 'human capital/personnel retention' budget includes a lot more unmarked cash payments than usual. What are th--" "Public outreach."
Prescience

Lots of people called their ships unsinkable before the Titanic. Voicing your hubris doesn't make failure more likely, just more memorable.
Earth-Like Exoplanet

Fire is actually a potential biosignature, since it means something is filling the atmosphere with an unstable gas like oxygen. If we find a planet covered in flames, it might be an indicator that it supports life. Or used to, anyway, before the fire.
Foucault Pendulum

Trust me, you don't want to get on the wrong side of the paramilitary enforcement arm of the International Earth Rotation and Reference Systems Service.
Unreachable State

ERROR: We've reached an unreachable state. Anything is possible. The limits were in our heads all along. Follow your dreams.
Cryptic Wifi Networks

They actually showed up on the first scan by the first WiFi-capable device.
Throw

this calculator implements the simple throwing distance estimation model from the how to throw things chapter of the book how to
Game Show

Eventually they agreed to "an auto-retracting dog leash with one end clipped to your house, so you can press the button on the handle and water-ski home."
Nice To E-Meet You

I'm inside your head and I hate it. Please let me out.
Dockless Roombas

The company started out exploiting a loophole in the law banning scooters. The city was mad at first, but then they noticed how much they were saving on street cleaning.
How to Send a File

Note: How To will teach you lots of cool stuff about technology, data storage, butterfly migration, and more. Also you will never see your files again.
Well-Ordering Principle

We could organize a nationwide old-photo-album search, but the real Worst McFly is probably lost to time.
Review

Controls are a little hard to figure out.
Conference Question

I also have an utterance. Less of an utterance and more of an incantation. Less of an incantation and more of a malediction. Less of a malediction and more of a Word of Power. Less of a Word of Power and more of an Unforgivable Curse.
Serena Versus the Drones

After the test, she said that if she had a choice, she wouldn’t defend herself against drones using a tennis ball and racket, though she would absolutely pick them over other sports equipment. But, she added, "Drones don't bother me."
Old Game Worlds

Ok, how many coins for a cinnamon roll?
E Scooters

Obviously battery technology and prices have driven a lot of the scooter explosion, but I feel like Dean Kamen must be at least a little grumpy about how much people laughed at the idea of the Segway.
Geologic Time

Ok, well, we'll be sure to pay you sometime soon, geologically speaking.
Dark Matter

To detect dark matter, we just need to build a bird feeder that spins two squirrels around the rim in opposite directions at relativistic speeds and collides them together.
Cumulonimbus

The rarest of all clouds is the altocumulenticulostratonimbulocirruslenticulomammanoctilucent cloud, caused by an interaction between warm moist air, cool dry air, cold slippery air, cursed air, and a cloud of nanobots.
Unpopular Opinions

I wasn't a big fan of 3 or Salvation, so I'm trying to resist getting my hopes up too much for Dark Fate, but it's hard. I'm just a sucker for humans and robots traveling through time to try to drive trucks into each other, apparently.
Icon Swap

Someone's probably working on an eBook app where, if you stop reading right before some plot twist happens, the app will wait a while and then send you a breaking news alert about what's happening, prompting you to open it and read the next few pages to learn more.
When I'm Back at a Keyboard
![[after typing 1,500 words on feathered dinosaurs, paleontology, sexism, lava, and dinosaurs as animals rather than movie monsters] Sorry to cut it short, I'm on my phone. When I'm back at a keyboard, I can give you another 5,000 words.](https://imgs.xkcd.com/comics/when_im_back_at_a_keyboard.png)
[after typing 1,500 words on feathered dinosaurs, paleontology, sexism, lava, and dinosaurs as animals rather than movie monsters] Sorry to cut it short, I'm on my phone. When I'm back at a keyboard, I can give you another 5,000 words.
Inbox

Rome's declaration of war against Carthage was sent from a no-reply address, so Hannibal had to cross the Alps to deliver his "UNSUBSCRIBE" response in person.
Spreadsheets

My brother once asked me if there was a function to produce a calendar grid from a list of dates in Google Sheets. I replied with a single-cell formula that took in a list of dates and outputted a calendar. It used SEQUENCE(), REGEXMATCH(), and a double-nested ARRAYFORMULA(), and it locked up the browser for 15 seconds every time it ran. I think he learned a lot about asking me things.
NWS Warnings

Kind of rude of them to simultaneously issue an EVACUATION - IMMEDIATE alert, a SHELTER IN PLACE alert, and a 911 TELEPHONE OUTAGE alert.
Expiration Date High Score

"Wait, we've MOVED since 2010. How on Earth did--" "Look, some of us were just born to be champions."
Gastroenterology

"Mostly it means that I'm acutely aware that the kid one table over coughed as the server walked past with our food."
How Hacking Works

If only somebody had warned them that the world would roll them like this.
Flag Interpretation

When Salvador Dalí died, it took months to get all the flagpoles sufficiently melted.
First News Memory

Psychology researchers say our 'flashbulb' memories of big events can be unreliable, but I clearly remember watching live on CNN as Challenger crashed into and destroyed the Berlin Wall.
Trained a Neural Net

It also works for anything you teach someone else to do. "Oh yeah, I trained a pair of neural nets, Emily and Kevin, to respond to support tickets."
Lunar Cycles

The Antikythera mechanism had a whole set of gears specifically to track the cyclic popularity of skinny jeans and low-rise waists.
Shadow Biosphere

The typical Shadow Biology Department is housed in a building coated in a thin layer of desert varnish which renders it invisible to normal-world university staff.
Coordinate Precision

40 digits: You are optimistic about our understanding of the nature of distance itself.
Predictive Models
![WE WILL ARREST THE REVOLUTION MEMBERS [AT THE JULY 28TH MEETING][tab] "Cancel the meeting! Our cover is blown."](https://imgs.xkcd.com/comics/predictive_models.png)
WE WILL ARREST THE REVOLUTION MEMBERS [AT THE JULY 28TH MEETING][tab] "Cancel the meeting! Our cover is blown."
Reading in the Original

The articles are much shorter, but I assume that's because this version predates the merger with the Hawaiian text that created the modern Hawaiian-Greek hybrid wiki-pedia.
Motivated Reasoning Olympics
![[later] I can't believe how bad corruption has become, especially given that our league split off from the statewide one a month ago SPECIFICALLY to protest this kind of flagrantly biased judging.](https://imgs.xkcd.com/comics/motivated_reasoning_olympics.png)
[later] I can't believe how bad corruption has become, especially given that our league split off from the statewide one a month ago SPECIFICALLY to protest this kind of flagrantly biased judging.
Stack

Gotta feel kind of bad for nation-state hackers who spend years implanting and cultivating some hardware exploit, only to discover the entire target database is already exposed to anyone with a web browser.
Millennials

Ironically, I've been having these same arguments for at least a decade now. I thought we would have moved on by now, but somehow the snide complaints about millennials continue.
Glacier

The Norwegian adaptation of The Sword in the Stone takes things in a weird direction.
Chernobyl

You know when you can't hear your speakers, and you keep turning various volume controls up higher and higher in confusion, and then someone hits the mute button and there's a deafening blast of sound? That's basically what happened at Chernobyl.
Literary Opinions

If I really focus, I can distinguish between John Steinbeck and John Updike, or between Gore Vidal and Vidal Sassoon, but not both at once.
An Apple a Day

Even the powerful, tart Granny Smith cultivar is proving ineffective against new Gran-negative doctors.
Ken Burns Theory

Some of the KBCU ancillary works try a little too hard to tie everything together. Doris Kearns Goodwin, the sports journalist featured in "Baseball," was somehow ALSO a famous historian who wrote bestselling biographies of Lincoln AND Johnson? Unrealistic.
Comments

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Qualifiers
![[20 minutes later] ", hi."](https://imgs.xkcd.com/comics/qualifiers.png)
[20 minutes later] ", hi."
Diploma Legal Notes

If you're planning to challenge the royal family, you should probably wait 6-8 weeks, since a number of the younger ones have diplomas and Kate was actually on the varsity lightsaber team at St Andrews.
Ufo

"It's a little low for a weather balloon; it might be some other kind." "Yeah. Besides, I know I'm the alien conspiracy guy, but come on--the idea that the government would care about hiding something so mundane as atmospheric temperature measurement is too ridiculous even for me."
Swimming

"You don't know how high above you the sky goes, but you're not freaking out about that." "Well, NOW I am!"
Motivation

What's even worse is, a month ago they transferred me to work on the game I was already playing, and suddenly I found myself procrastinating by playing the one I'd been assigned before. It's possible they're onto me and this is all part of the plan.
Effects of High Altitude

If she'd lived in Flagstaff (elevation 6,903 feet), Cruella de Vil would only have needed 89 dalmatians for her coat.
Westerns

Sitting here idly trying to figure out how the population of the Old West in the late 1800s compares to the number of Red Dead Redemption 2 players.
A/B

We wrote our site in Linear A rather than Aksara Kawi because browser testing showed that Crete script rendered faster than Java script.
XKeyboarCD

The key caps use LCD displays for all the vowels, so they can automatically adjust over the years to reflect ongoing vowel shifts while allowing you to keep typing phonetically.
Alternate Histories

"So their universe wouldn't have the iconic photo of a screaming Truman being hoisted aloft by the newspaper-printing machinery..."
Cubesat Launch

Luckily, the damages were partly offset by the prize money we got from accidentally winning the nearby water skiing championship tournament.
Appendicitis

Fortunately, after a brief skirmish, I seem to have gained the upper hand in the battle against my internal organs, at least until they learn to read and find out the mean stuff I've said about them.
Waiting for the But

Listen, I'm not a fan of the Spanish Inquisition OR predatory multi-level marketing schemes...
Heists And Escapes

The interactive experience is built on a single theological framework that unites Dante, George R. R. Martin, every major heist movie, and Erin Gloria Ryan's "Kevin is dead" Home Alone theory.
Adjusting a Chair

When I was looking at the box, I should have thought more about what "360 degrees of freedom" meant.
Disk Usage
![Menu -> Manage -> [Optimize space usage, Encrypt disk usage report, Convert photos to text-only, Delete temporary files, Delete permanent files, Delete all files currently in use, Optimize menu options, Download cloud, Optimize cloud , Upload unused space to cloud]](https://imgs.xkcd.com/comics/disk_usage.png)
Menu -> Manage -> [Optimize space usage, Encrypt disk usage report, Convert photos to text-only, Delete temporary files, Delete permanent files, Delete all files currently in use, Optimize menu options, Download cloud, Optimize cloud , Upload unused space to cloud]
Dangerous Fields

Eventually, every epidemiologist becomes another statistic, a dedication to record-keeping which their colleagues sincerely appreciate.
UI vs UX
![U[unprintable glyph]: The elements a higher power uses to bend that moral arc. U[even more unprintable glyph]: The higher power's overall experience bending that moral arc.](https://imgs.xkcd.com/comics/ui_vs_ux.png)
U[unprintable glyph]: The elements a higher power uses to bend that moral arc. U[even more unprintable glyph]: The higher power's overall experience bending that moral arc.
Reinvent the Wheel

Right now it's a bicycle wheel, so we've had to move to lighter vehicles, but the reduced overhead is worth it. There was one week when a wheel of cheese got dangerously close to the first page, though.
Email Settings

What are all these less-than signs? What's an HREF? Look, we know you live in a fancy futuristic tech world, but not all of us have upgraded to the latest from Sun Microsystems.
Wanna See the Code?

And because if you just leave it there, it's going to start contaminating things downstream even if no one touches it directly.
Text Entry

I like to think that somewhere out there, there's someone whose personal quest is lobbying TV providers to add an option to switch their on-screen keyboards to Dvorak.
Election Commentary

This really validates Jones's strategy of getting several thousand more votes than Smith. In retrospect, that was a smart move; those votes were crucial.
M87 Black Hole Size Comparison

I think Voyager 1 would be just past the event horizon, but slightly less than halfway to the bright ring.
Too Much Talking

Next time I go, I'm going to prepare a whole bunch of opinions that I'm sure are good, and make everyone sit quietly while I run through them.
EHT Black Hole Picture
![[five years later] Ok, it seems we were accidentally zoomed in slightly too far. But imagine there's a cool-looking twisted accretion disc just outside this black square!](https://imgs.xkcd.com/comics/eht_black_hole_picture.png)
[five years later] Ok, it seems we were accidentally zoomed in slightly too far. But imagine there's a cool-looking twisted accretion disc just outside this black square!
Percentage Styles

In a tribute to classical Latin, I started pronouncing it 'per-kent.' Eventually my friends had to resort to spritzing me with a water bottle like a cat to train me out of it.
Emojidome

Thank you to the xkcd April 1st volunteers/commentators, including @Chromakode, Kevin, @Aiiane, Patrick, Kat, Reuven, @cotrone, @bstaffin, @zigdon, schwal, Stereo, and everyone who voted!
Industry Nicknames

As far as "being in the pocket of Big Egg" goes, I think the real threat is Chansey.
1921 Fact Checker

POLITIFACT SAYS: MOSTLY WHATEVER
New Robot

"Some worry that we'll soon have a surplus of search and rescue robots, compared to the number of actual people in situations requiring search and rescue. That's where our other robot project comes in..."