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Received yesterday — 7 September 2026 ⏭ xkcd.com

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Semaphore 6 September 2026 at 19:00

Semaphore

xkcd.com

6 September 2026 at 19:00

The speed of light in air is 50% faster than in fiber, but it's a challenge to get the arms to move fast enough to realize the latency advantage.

Received — 4 September 2026 ⏭ xkcd.com

xkcd.com
Asteroid Mission 3 September 2026 at 19:00

Asteroid Mission

xkcd.com

3 September 2026 at 19:00

Lander, this is Houston. There's been a request that you turn clipping back on and instead set the mass to 1kg. The theorists believe that will be pretty funny.

Received — 2 September 2026 ⏭ xkcd.com

xkcd.com
Handedness 1 September 2026 at 19:00

Handedness

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1 September 2026 at 19:00

A 'left-handed specialist' is a physicist who studies the weak interaction.

Received — 31 August 2026 ⏭ xkcd.com

xkcd.com
Geology Class 30 August 2026 at 19:00

Geology Class

xkcd.com

30 August 2026 at 19:00

The rise of AI review bombing tools threatens to take away a crucial source of experience for geology undergraduates.

Received — 28 August 2026 ⏭ xkcd.com

xkcd.com
Launchpad 27 August 2026 at 19:00

Launchpad

xkcd.com

27 August 2026 at 19:00

It does come at the cost of some launchpad expansions and increased fuel requirements, but that all comes out of the facility's budget.

Received — 26 August 2026 ⏭ xkcd.com

xkcd.com
Trade 25 August 2026 at 19:00

Trade

xkcd.com

25 August 2026 at 19:00

"You legs may have a comparative advantage at running, but we arms have a competitive advantage at swinging hammers, so unless you accept that we're the dominant limbs and stop hogging the oxygen, that running advantage won't be around for long."

Received — 24 August 2026 ⏭ xkcd.com

xkcd.com
Highway Signs 23 August 2026 at 19:00

Highway Signs

xkcd.com

23 August 2026 at 19:00

Highway engineers like Planck units because, like the speed of light, the energy capacity of a typical car's gas tank is 1.

Received — 21 August 2026 ⏭ xkcd.com

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xkcd store reopening 20 August 2026 at 19:00

xkcd store reopening

xkcd.com

20 August 2026 at 19:00

The xkcd store is back, with shirts, stickers, and posters for sale.

xkcd.com
Archery Feat 20 August 2026 at 19:00

Archery Feat

xkcd.com

20 August 2026 at 19:00

Update: I would not have embarked on this powerscaling venture if I'd known how thoroughly Mark Twain was going to roast me.

Received — 19 August 2026 ⏭ xkcd.com

xkcd.com
Perseids 18 August 2026 at 19:00

Perseids

xkcd.com

18 August 2026 at 19:00

Recently I've been watching the Daytime Perseids. I haven't seen a meteor from them yet, but the clouds are pretty and the snacks are good.

Received — 18 August 2026 ⏭ xkcd.com

xkcd.com
Particle Physics Equipment 16 August 2026 at 19:00

Particle Physics Equipment

xkcd.com

16 August 2026 at 19:00

The one that sounds like the oracle at the center of the galaxy where the hero travels to hear a prophecy is probably Brookhaven National Laboratory's now-dismantled COSMOTRON.

Received — 14 August 2026 ⏭ xkcd.com

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Accretionary Arc 13 August 2026 at 19:00

Accretionary Arc

xkcd.com

13 August 2026 at 19:00

The late Triassic rifting was caused by a dinosaur trying to use the control panel to escape a predator, but it was eaten before the continent could fully separate.

Received — 12 August 2026 ⏭ xkcd.com

xkcd.com
Geology Building 11 August 2026 at 19:00

Geology Building

xkcd.com

11 August 2026 at 19:00

The administration thinks it's weird, but the geologists say it looks normal.

Received — 10 August 2026 ⏭ xkcd.com

xkcd.com
Size and Lifespan 9 August 2026 at 19:00

Size and Lifespan

xkcd.com

9 August 2026 at 19:00

With their 13 years recording and performing together and two humans worth of mass, the White Stripes are sandwiched neatly between gray wolves and blue whales.

Received — 7 August 2026 ⏭ xkcd.com

xkcd.com
Trick Play 6 August 2026 at 19:00

Trick Play

xkcd.com

6 August 2026 at 19:00

I've been trying to find out whether the Laws of the Game take the axiom of choice or not, but FIFA officials keep blocking my number.

Received — 5 August 2026 ⏭ xkcd.com

xkcd.com
Antiques Roadshow 4 August 2026 at 19:00

Antiques Roadshow

xkcd.com

4 August 2026 at 19:00

The family lore was that we've had it ever since it was ejected from a star-forming gas cloud, but it seems more likely that my great-grandparents probably just bought it while on vacation in the galactic thin disk.

Received — 3 August 2026 ⏭ xkcd.com

xkcd.com
Maze 2 August 2026 at 19:00

Maze

xkcd.com

2 August 2026 at 19:00

As a side effect of the research, mice are now the only known animals other than humans to have developed a Backrooms mythology.

Received — 31 July 2026 ⏭ xkcd.com

xkcd.com
Main Span 30 July 2026 at 19:00

Main Span

xkcd.com

30 July 2026 at 19:00

Wind stress? Don't be silly. When has wind stress ever been a problem for a suspension bridge?

Received — 29 July 2026 ⏭ xkcd.com

xkcd.com
Vera Rubin Observatory 28 July 2026 at 19:00

Vera Rubin Observatory

xkcd.com

28 July 2026 at 19:00

'Spurious signals from the kitchen' is harder for an optical telescope than a radio one, but with enough determination and creativity, I believe it's possible.

Received — 27 July 2026 ⏭ xkcd.com

xkcd.com
Forth 26 July 2026 at 19:00

Forth

xkcd.com

26 July 2026 at 19:00

I NOTATION POLISH REVERSE ❤️