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xkcd.com: A webcomic of romance and math humor.

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Mantle Model

Mantle plumes explain Hawaii, Yellowstone, Iceland, the East African Rift, the Adirondack uplift, the Permian extinction, the decline of Rome, the DB Cooper hijacking, and the balrog in Moria. Those little hills of sand in your yard are caused by antle plumes.

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Biology Department

Welcome to the Linguistics Department - It has been [2] [DAYS] since someone noticed that the Biology Department sign has a one-day-long singular/plural disagreement after it resets.

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Chess Variant

The draw-by-repetition rule does a good job of keeping players from sliding a tile back and forth repeatedly, but the tiles definitely introduce some weird en passant and castling edge cases.

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Dimensional Lumber Tape Measure

A person with two watches is never sure what time it is, especially if I got them one of the watches.

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Cursed Number

Another group of mathematicians is working to put an upper bound on the number, although everyone keeps begging them to stop.

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Pull

Be careful fighting gravity. If you win, it's a long way down.

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Sea Level

They're up there with coral islands, lightning, and caterpillars turning into butterflies.

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Wavefunction Collapse

Wavefunction collapse is only one interpretation. Under some interpretations, graduate students also have souls.

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Dual Roomba

I tried uploading it to a household appliance porn site I found, but apparently their content is limited to only fans.

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Coastline Similarity

Hey! A bunch of the early Cretaceous fossils on each coast seem to have been plagiarized, too!

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Cesium

Someday I hope to find a way to mess up a recipe so badly that it draws the attention of the International Air Transport Association, the International Mathematical Olympiad, or the NSA.

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Predicament

I dropped my phone while trying to search, and I tried to unlock it from up here, so can you also search for screen repair places?

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Archaeology Research

The academic archaeology establishment is suppressing my breakthroughs because of the disruption it would bring to their prepared-core flake-based toolmaking industry.

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Thread Meeting

Hey, so did you ever finish your video series about Cassie and the caterpillar morph? I loved the first three, but never ... no, sorry, I get it, this isn't the place. Sorry! Sorry.

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Where Babies Come From

Historians: Contemporaneous documentation of the initial events is often sparse, and in fact people often get testy and uncooperative when we urge better documentation for the historical record.

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Disclaimer

You say no human would reply to a forum thread about Tom Bombadil by writing and editing hundreds of words of text, complete with formatting, fancy punctuation, and two separate uses of the word 'delve'. Unfortunately for both of us, you are wrong.

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Snake-in-the-Box Problem

Chemistry grad students have been spotted trying to lure campus squirrels into laundry hampers in the hope that it sparks inspiration.

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Grounded

We should have you at the gate in just under two hours--two and a half if we get pulled over.

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Canon

Achilles was a mighty warrior, but his Achilles' heel was his heel.

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Bad Map Projection: Interrupted Spheres

During the most recent glacial maximum, it's believed that land bridges extended from the surfaces and connected several of the spheres together.

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Kite Incident

Detectives say the key to tracking down the source of the kites was a large wall map covered in thumbtacks and string. 'It's the first time that method has ever actually worked,' said a spokesperson.

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Geologic Periods

Geologists claim it's because the earlier Cenozoic used to be called the Tertiary, but that's just a ruse to hide the secret third geologic period, between the Neogene and the Quaternary, that they won't tell us about.

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Flettner Rotor

"And in maritime news, the Coast Guard is on the scene today after an apparent collision between two lighthouses."

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iNaturalist Animals and Plants

Washington, DC: Eastern gray squirrel, Amur honeysuckle. Puerto Rico: Crested anole, sea grape. US as a whole: Mallard, eastern poison ivy.

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Replication Crisis

Maybe encouraging the publication of null results isn't enough--maybe we need a journal devoted to publishing results the study authors find personally annoying.

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Echo Chamber

This is almost as bad as the time I signed up for a purely partisan fishing expedition.

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Unsolved Physics Problems

'Tin pest' makes more sense to me. Tin just doesn't want to be locked down in a shape like that. I get it. But why would any metal want to grow hair??

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Building a Fire

That was quicker than usual! The cabin's sprinkler system often makes it really hard to keep anything lit.

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Fix This Sign

We're building on our earlier success getting web developers to pay to change the backslashes in our displayed payment URL to forward slashes.

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Geology Murder

After determining that his body was full of pipes carrying iron-rich fluid, our current theory is that the dagger-shaped object precipitated within the wound.