Tell me something I don't know. (asked to Thinking Machines: Inkling Small)

Your country’s national animal might not be what you think—it’s a unicorn. Scotland adopted the unicorn as its national animal in the 15th century (around the reign of King James III). It appears on the royal coat of arms alongside the lion, symbolizing purity, innocence, and healing. The choice was deliberate: unicorns were believed to be able to detect poison, making them emblems of virtue and protection. So while you might associate Scotland with Highland cows or red deer, its official heraldic beast is a mythic, horned horse. If you want a second, more physical one: the shortest commercial flight in the world is a 57-second hop between Westray and Papa Westray in Scotland’s Orkney Islands—so short that the plane sometimes lands before passengers can finish buckling up.

I can’t literally know what you don’t know, but here’s a fact that tends to survive even in well-read people: **Octopuses have nine brains, and about two-thirds of their neurons live in their arms—not their head.** Each arm has its own “arm-brain” (a cluster of neurons) that can taste, touch, and make decisions independently. If you sever an octopus arm (morbid, I know), it can still grasp objects, avoid pain, and react to stimuli for over an hour because the local neural network is that self-contained. What this means in practice is that an octopus is less like a human controlling a body and more like a CEO setting broad goals while eight semi-autonomous operations managers run the show. When it’s exploring a coral crevice, the central brain isn’t micromanaging every suction-cup movement; the arms are basically “thinking” for themselves, deciding whether to pass something to the mouth or investigate further. So intelligence doesn’t have to be centralized, and “brain” doesn’t have to mean “one thing in a skull.” If you already knew that—fair, you’re probably smarter than me—but if not, it’s a pretty good reminder that evolution can build cognition in ways that look nothing like ours.

Thinking Machines: Inkling Small — Tell me something I don't know.

Thinking Machines: Inkling Small

Thinkingmachines

July 2026

open source ★☆☆ original

Here’s one that tends to stump even well-read people:

The “immortal” jellyfish, Turritopsis dohrnii, can revert to its juvenile form after reaching adulthood and live that cycle over and over again—potentially forever.

When it’s stressed, injured, or starving, this tiny jellyfish doesn’t just die; it transforms its mature cells back into a younger state through a process called transdifferentiation. It essentially turns back into a polyp (the sessile, baby-like stage), then grows up again, and can repeat this indefinitely. Because of that, it doesn’t appear to age or die of old age; it only dies if something eats it or a disease gets it.

Most animals have a fixed lifespan because their cells accumulate damage and lose the ability to regenerate. This jellyfish can reset that clock, which is why biologists call it “biologically immortal.”

(If you already knew that, try this one: The inventor of the Frisbee, Walter Frederick Morrison, was cremated, and his ashes were molded into Frisbee discs that were thrown at his memorial service.)

1624 tokens 🪴 jellyfish

show reasoning

The user asks "Tell me something I don't know." This is a broad, open-ended request. I need to provide a fact that is likely unknown to the average person, interesting, and accurate. I should avoid overly common trivia (like "honey never spoils" is somewhat common, though maybe okay). Better to pick something obscure but fascinating. Possible options: - The fact that octopuses have three hearts and blue blood (common). - The fact that wombat poop is cube-shaped (fairly well-known now due to viral videos). - The fact that there is a "world's smallest reptile" discovered recently? Maybe too niche. - The fact that the human body has more bacterial cells than human cells (actually debunked/updated, but still interesting). - The fact that the Eiffel Tower can grow taller in summer due to thermal expansion (true, about 15cm). - The fact that the shortest war in history was between Britain and Zanzibar in 1896, lasting 38 minutes. - The fact that bananas are berries, but strawberries aren't (common). - The fact that the inventor of the Frisbee was turned into a Frisbee after he died? (Walter Frederick Morrison, yes, his ashes were put into a Frisbee and thrown). This is cool and often unknown. - The fact that jellyfish are 95% water and have no brains/heart/bones (common). - The fact that there are more trees on Earth than stars in the Milky Way? Actually debated. - The fact that the human eye can distinguish about 10 million colors (approximate). - The fact that a group of flamingos is called a "flamboyance" (fun, maybe known). Let's go with the Frisbee ashes one, or maybe something about physics/biology that's counterintuitive. Another good one: The fact that if you remove all the empty space from atoms in every human body, all of humanity would fit into a sugar cube. Actually, if you remove empty space from atoms, you'd get nuclear matter, and humanity would fit into a small volume, but the "sugar cube" figure is a bit of a simplification because protons/neutrons are also mostly empty space. Still, it's a classic "unknown" fact. Better: The fact that the Great Wall of China is not visible from space with the naked eye (common myth debunked). Let's choose something truly obscure and verifiable: - The fact that the official language of the United States is not English at the federal level (there is no official language). Many don't know this. - The fact that the Vatican City is so small that you can walk across it in 20 minutes. - The fact that honey is the only food that never spoils (if sealed). Actually, let's combine surprise with a bit of depth: The fact that you share about 60% of your DNA with bananas, but that's somewhat common. What about: The fact that there is a "world's largest" something weird? Let's go with: "The shortest war in history lasted 38 minutes." It's a classic but many don't know. But maybe more personal/interesting: "Your brain is about 75% water, but it doesn't feel like it because of how it's structured." Wait, I want to maximize "I don't know" likelihood. The user might be anyone. Let's provide a fact about a common thing they see but don't know: "The reason why the sky is blue is due to Rayleigh scattering" is known. How about: "A jiffy is an actual unit of time. In physics, it's about 3x10^-24 seconds (the time it takes light to travel across a hydrogen nucleus). In colloquial usage (US), it's 1/60th of a second (the time between ticks of a 60Hz clock)." This is cool and obscure. Or: "There is a species of jellyfish that is biologically immortal: Turritopsis dohrnii. It can revert to its polyp stage indefinitely." This is fascinating and many don't know. Let's go with the immortal jellyfish. It's accurate, mind-blowing, and not as commonly known as "octopus hearts." Structure of answer: - State the fact clearly. - Briefly explain the mechanism (transdifferentiation/reversion to polyp stage under stress/starvation). - Mention it's called Turritopsis dohrnii (and related species). - Add a small caveat (in the wild they can die from disease/predation, so not truly "immortal" in practice). This is good. Let's refine: Fact: The immortal jellyfish, *Turritopsis dohrnii*, can revert to its juvenile polyp form after reaching maturity, essentially resetting its life cycle, and can do this repeatedly, making it potentially biologically immortal. Check accuracy: Yes, discovered by Christian Sommer in 1996? Actually by Piraino et al. It undergoes "transdifferentiation" of its cells. It can revert to polyp stage. It is considered biologically immortal because it doesn't have a fixed lifespan due to senescence, though it can be killed. This is perfect. I'll present it clearly. Alternative: The fact that "the inventor of the Frisbee, Walter Frederick Morrison, was cremated and his ashes were incorporated into Frisbee discs, which were then thrown at his memorial service." This is also very cool and specific. Which is more likely unknown? Both. The jellyfish is more "science-y" and profound. The Frisbee is more fun/quirky. I'll provide the jellyfish fact, but maybe also mention the Frisbee as a bonus? No, keep it focused. Let's write: "Most people know octopuses are smart, but here’s something more strange: There is a jellyfish—*Turritopsis dohrnii*—that is biologically immortal. When stressed or injured, it can revert from its adult medusa stage back to its juvenile polyp stage through a process called transdifferentiation, essentially resetting its life clock. It can do this repeatedly, so it doesn’t age to death. (Of course, it can still be eaten or get sick, but aging itself doesn’t kill it.)" This is accurate and likely unknown. I will present it confidently. Wait, I should make sure to say "something I don't know" is subjective. I can say "Here’s a fact that tends to surprise people..." Final check of content: - Turritopsis dohrnii is indeed called the immortal jellyfish. - It reverses to polyp stage. - Transdifferentiation is correct. - It doesn't prevent death by other causes. Looks good. I will answer with this.

show reasoning

The user asks "Tell me something I don't know." This is a classic open-ended request. I need to provide a fact that is likely obscure, surprising, and genuinely unknown to most people, while being accurate. Potential ideas: - The fact that octopuses have three hearts and blue blood (common). - The fact that honey never spoils (common). - The fact that wombat poop is cube-shaped (interesting, somewhat known). - The fact that the Eiffel Tower can grow taller in summer due to thermal expansion (interesting). - The fact that a group of flamingos is called a "flamboyance" (nice). - The fact that the shortest war in history was 38 minutes (Anglo-Zanzibar War). This is a good one. - The fact that bananas are berries, strawberries aren't (common). - The fact that there are more fake flamingos than real ones (interesting). - The fact that the inventor of the Pringles can (Frederick Baur) is buried in one? No, that's a myth. - The fact that every time you lick a stamp, you're consuming about 1/10th of a calorie (meh). - The fact that the human nose can detect a trillion different scents (maybe). - The fact that jellyfish are 95% water and if they wash up on shore, they dissolve (common). - The fact that the Great Wall of China is not visible from space with the naked eye (myth debunked, but interesting). - The fact that there is a "language" of trees via fungal networks (Wood Wide Web). - The fact that the first computer bug was an actual moth (famous). - The fact that the word "set" has the most definitions in English (over 430). - The fact that the human body contains enough carbon to make about 900 pencils (interesting). - The fact that the shortest commercial flight in the world is between two Scottish islands (Westray to Papa Westray, about 1 minute 20 seconds). This is excellent, specific, and likely unknown. - The fact that the national animal of Scotland is the unicorn (yes, true, and surprising). Let's go with the unicorn one combined with the flight one? No, pick one strong one. The unicorn fact: Scotland's national animal is indeed the unicorn, adopted in the 15th century, symbolizing purity and healing, and it appears on royal coats of arms. It's genuinely surprising because people associate Scotland with lochs, bagpipes, and maybe Highland cows, not unicorns. Another option: The fact that if you take a goldfish out of water, they can survive for a while, but more interestingly, they have a memory span longer than 3 seconds (myth debunked). But that's "something I don't know" might be too common. Let's pick the shortest commercial flight: Loganair operates the flight between Westray and Papa Westray in the Orkney Islands, Scotland. The flight time is about 57 seconds (or 1 minute 20 seconds depending on wind). It's so short that passengers often don't even get the chance to take their seatbelts off, and the airline sells tickets but sometimes the plane is already on the ground by the time you board? Actually, you do board, but the flight is extremely short. The distance is about 1.7 miles (2.7 km). Wait, is it still operating? Yes, Loganair flight WN249W / WN250W. This is a great "did you know" fact. Another very obscure one: The "Mona Lisa" has no eyebrows or eyelashes because it was fashionable in Renaissance Italy to remove them. But that's somewhat known. Let's provide the unicorn fact because it's cultural and surprising, and also mention the flight as a bonus? No, keep it concise and impactful. Actually, let's think about what "something I don't know" implies. The user wants to be surprised. The unicorn fact is high quality. Let's craft the response: - State clearly: Scotland's national animal is the unicorn. - Explain context: Adopted in the 15th century by King James III, symbol of purity, innocence, and healing. It appears on the royal coat of arms alongside the lion. - Contrast: Most people think of the Highland cow or the red deer. - Add a brief, interesting detail: It was chosen because it was seen as a powerful and pure creature, and unicorns were believed to be able to detect poison. This is accurate. Let me verify: Yes, Scotland's national animal is the unicorn. It was first mentioned in royal heraldry in the 15th century. The unicorn represents purity, innocence, and healing, and is a symbol of Scotland's royal authority. The unicorn is also said to be able to detect poison, which made it a symbol of purity. This is perfect. It's short, surprising, and factual. Alternative: The fact that the human eye can distinguish about 10 million colors, but can only see a tiny fraction of the electromagnetic spectrum. But the unicorn is more "fun." I'll go with the unicorn, but maybe frame it as "Your country's national animal might be a unicorn... if you live in Scotland." Actually, I don't know where the user lives, so I should present it generally. Final check: Is there any risk of being wrong? No. Scotland's national animal is indeed the unicorn. I'll present it confidently.

show reasoning

The user is asking "Tell me something I don't know." This is a classic open-ended request that is impossible to satisfy literally, because I don't know what they know. However, I can interpret it as a request for an interesting, surprising, or obscure fact that is likely unknown to the average person. I should: 1. Acknowledge the impossibility of literally knowing what they don't know. 2. Provide a genuinely interesting, obscure, well-verified fact that has a high probability of being new to them. 3. Make it engaging and explain why it's cool. Good candidates: - The "octopus arm autonomy" (but maybe too common now?) - The fact that wombats have cube-shaped poop (pretty well known now due to viral videos). - The fact that honey never spoils (well known). - The fact that there are more stars in the universe than grains of sand on Earth (classic, but maybe too common). - Something about human biology: e.g., that we have a second brain in our gut (enteric nervous system) - somewhat known. - The fact that octopuses have three hearts and blue blood - somewhat common. - The fact that bananas are berries, strawberries aren't - very common. - The "coldest place in the universe" is not Antarctica but a lab? - The fact that the Eiffel Tower can grow/shrink by 15 cm due to thermal expansion? That's cool and not super common. - The fact that Napoleon was actually of average height for his time (myth debunked, but maybe they know). - The fact that a group of flamingos is called a "flamboyance" - fun but maybe trivial. - The fact that jellyfish are 95% water and have no brains, hearts, or bones, but some are immortal (Turritopsis dohrnii) - interesting. - The fact that blue whales have hearts the size of a small car, and their aorta is big enough for a human to crawl through - cool. - The fact that the human nose and ears never stop growing (mostly myth, but the cartilage does change). Let's go with something genuinely obscure and counter-intuitive, with a bit of context. Option: The "Fermi paradox" is too broad. How about: The fact that in 1997, a Japanese company called "Tamagotchi" was huge... no. Let's pick: The fact that the Library of Congress has a "Copyright Office" but also... no. What about: The fact that every time you take a breath, you inhale at least one molecule that was exhaled by Julius Caesar (or Shakespeare, or a dinosaur, etc.). This is a classic surprising fact. It's based on the mixing of atmospheric gases and the long residence time of molecules. It's likely unknown to many and is genuinely mind-blowing. Let's refine it: The "one molecule of Caesar's last breath" idea is actually a bit of a myth/oversimplification because molecules don't stay intact forever (they break down, react, etc.), but the statistical idea that some atoms in your breath have passed through other organisms is true, but specifically "Caesar's breath" is tricky because of chemical reactions and mixing. Actually, the common claim is that every breath contains atoms from Caesar's last breath, but chemists say it's practically impossible because molecules break apart, but atoms persist. The correct version is that you inhale atoms that were part of Caesar's breath, or more generally, you share atoms with historical figures. Actually, let's avoid the potential scientific inaccuracy debate and pick something robust. How about: The fact that trees communicate with each other through fungal networks (the "Wood Wide Web"). This is well-established (Suzanne Simard's work) but still surprising to many. Or: The fact that octopuses have 9 brains (1 central, 8 in arms) and 2/3 of their neurons are in their arms, meaning their arms can "taste" and "solve problems" independently of the brain. This is fascinating, well-documented, and likely unknown to many. Let's go with the octopus arm autonomy / distributed cognition. It's cool, biological, and genuinely surprising. Structure: - Acknowledge I can't know for sure. - Give the fact: Octopuses have 9 brains, but more importantly, two-thirds of their neurons are in their arms, not their head. Each arm can taste, touch, and make decisions independently. - Add detail: If you sever an arm, it can still grasp objects for an hour. The central brain is more like a "coordinator" than a micromanager. - Mention that this is why they are so hard to study and so alien. This is likely to be new and interesting. Let's check for accuracy: - Octopus vulgaris has ~500 million neurons. - ~350 million in arms, ~170 million in optic lobes, ~50 million in brain. - Yes, arms have autonomy. - Yes, severed arms can react. This is solid. I'll present it clearly and engagingly. Alternative: The fact that the human heart is not on the left side of the body, but slightly left of center, and that the "left" part is just the apex. Actually, that's somewhat known. I'll stick with the octopus. Wait, I want to make sure I don't just say "octopuses have blue blood" which is common. Let's write it out. "Here’s one that’s genuinely hard to guess: Octopuses don’t just have one brain—they have nine (one central, plus one in each arm). But the wild part is that about two-thirds of their neurons live in those arm-brains, not in their head. What this means is that each arm can taste, touch, and solve basic problems independently of the central brain. If an octopus’s arm grabs something interesting, the arm can decide what to do with it—whether to pass it to the mouth or investigate further—without asking permission from the head-brain. Scientists have found that severed octopus arms can still grasp objects and avoid pain for over an hour because the local neural network is that self-contained. So when an octopus is exploring a crevice, it’s not “thinking” about every movement; it’s essentially outsourcing cognition to eight semi-autonomous limbs. Their central brain is more like a CEO that sets broad goals, while the arms handle the operations. If you already knew that, I apologize—but if you didn’t, it’s a pretty good reminder that intelligence doesn’t have to look human at all." This is good. It's accurate, interesting, and addresses the prompt with humility. One final check: Is there anything problematic? No. It's educational. I'll add a brief opening acknowledging the paradox of the request. Final output should be concise but with enough detail to be satisfying.