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general relativity for babies

Someone captured the solar eclipse on an airplane

'Physics for Cats' is my next collection of science cartoons. It'll be out in the autumn. More details and an excerpt are here: www.drawnandquarterly.com/books/physics-for-cats/

{Words by Anaïs Nin, from The Diary Of Anais Nin, Vol. 4 (1944-1947) / Cynthia Cruz from diagnosis,The glimmering room}

NGC 2244, Cosmic Rose

In this video, take a flight through millions of galaxies mapped using coordinate data from DESI.

Credit: Fiske Planetarium, CU Boulder and DESI collaboration

astrohumanist

Tips for writing plot twists

1. Start with a false sense of security

• The best plot twists work because the audience feels confident they know what’s coming.

• How? Lay down a trail of clues that mislead without outright lying. Create a sense of inevitability.

• Example: A detective follows all the evidence to one suspect, only for the real criminal to be someone they completely overlooked.

2. Plant the seeds early

• A plot twist is most satisfying when it feels inevitable in hindsight. Subtly sprinkle clues throughout the narrative.

• How? Use small, seemingly insignificant details that take on new meaning after the reveal.

• Example: A side character is always conveniently absent during key events—later revealed to be orchestrating everything.

3. Subvert expectations without betraying logic

• A twist should surprise readers, but it must feel plausible within the story’s framework.

• How? Flip assumptions in a way that feels earned. Avoid twists that rely on coincidences or break the rules of your world.

• Example: A character who appears harmless and incompetent is revealed as the mastermind, with subtle foreshadowing tying everything together.

4. Exploit emotional investment

• Twists land harder when they involve characters the audience deeply cares about. Use relationships and personal stakes to heighten the impact.

• How? Create twists that change how readers perceive the characters they thought they knew.

• Example: The protagonist’s mentor is revealed to be the antagonist, making the betrayal personal and devastating.

5. Use red herrings strategically

• Mislead readers by planting false clues that draw attention away from the real twist.

• How? Make the red herrings believable but not overly obvious. They should enhance, not distract from, the story.

• Example: A mysterious object everyone believes is cursed turns out to be completely irrelevant, shifting focus from the true danger.

6. Timing is everything

• Reveal the twist at the moment it has the most dramatic or emotional weight. Too early, and it loses impact. Too late, and it feels rushed.

• How? Build tension to a breaking point before the twist shatters expectations.

• Example: A twist that flips the climax—when the hero thinks they’ve won, they realize they’ve fallen into the villain’s trap.

7. Allow for multiple interpretations

• A great twist makes readers rethink the entire story, encouraging them to revisit earlier scenes with new understanding.

• How? Design the twist so that the story works both before and after the reveal.

• Example: A character’s cryptic dialogue is recontextualized after the twist, revealing their hidden motives.

8. Pair the twist with consequences

• A twist shouldn’t just shock—it should change the trajectory of the story. Make it matter.

• How? Show how the twist raises the stakes or deepens the conflict, forcing the characters to adapt.

• Example: After discovering the villain is their ally, the protagonist must choose between loyalty and justice.

9. Keep the reader guessing

• A single twist is good, but layered twists create an unforgettable story. Just don’t overdo it.

• How? Build twists that complement each other rather than competing for attention.

• Example: A twist reveals the villain’s plan, followed by a second twist that the hero anticipated it and set a counter-trap.

10. Test the twist

• Before finalizing your twist, ensure it holds up under scrutiny. Does it fit the story’s logic? Does it enhance the narrative?

• How? Ask yourself if the twist creates a moment of genuine surprise while respecting your audience’s intelligence.

• Example: A shocking but clever reveal that leaves readers satisfied rather than feeling tricked.

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Okay so a guy in my solid state physics class was telling us about this muon scanning startup he worked at, GScan, and I'm going insane. I don't work there and I have no stake in the company, financial or otherwise, I just need to tell you about it.

Muons are short-lived subatomic particles, same charge as an electron but ~200 times more massive. On Earth, they're produced by cosmic rays colliding with the upper atmosphere, and they hit the ground at a rate of about ten thousand per minute per square meter.

They're moving extremely fast at ground level, like 0.99 c. So they careen right through matter, deflecting only very slightly around heavy atomic nuclei – they'll penetrate like a hundred meters into solid rock.

What do you do with this continuous shower of deep-penetrating charged particles, constantly blanketing every square inch of the Earth's surface?

(source)

The classic thing is use them to image the inside of massive structures, like we use x-rays to look inside living tissue – except instead of generating them yourself, you just use atmospheric muons. Muon archeology is a whole thing, they've used it to find hidden chambers in pyramids and stuff. Neat!

But this one Estonian company is doing some crazy bullshit and I love it.

Sandwich anything between a pair of portable muon detectors and get full 3D imaging of the interior, with sub-millimeter accuracy, by tracking the minute deflection of muons between them. Samples that are WAY too thick for x-rays, made of literally anything. Just put some muon detectors on some two by fours in a warehouse and call it a day.

You can just. Image anything??? Anything you want?? Completely passively!! Just detectors! No particle source! Put them anywhere. The detectors themselves are a mature technology, the company's tech is in the algorithms they use to get this level of spatial and elemental resolution.

You can detect failures inside cable-reinforced concrete bridges without cutting open the bridges.

Decommissioned Soviet nuclear submarine filled with concrete, with no drawings or documentation, that may or may not have spent fuel canisters in it? And you need to cut it up for storage? Just look at the muons.

One of the wackiest ideas is to put one detector under your bed and one on the ceiling, so you get a full 3D scan of your body every night, passively. I want one.

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