Archive
All 170 essays, grouped by category. Longest first within each.
Biology & Evolution
Biology & Health
Kin selection explains altruism in nature: organisms sacrifice for relatives because shared genes benefit when relatives survive.
How experience, environment, and behavior alter which genes get expressed — without changing the DNA sequence itself.
Business & Economics
Crossing an ocean can cost less per item than the final eight kilometres. Once you see logistics as handling events rather than distance covered, most of the field makes sense.
If people departed randomly from rational choice, the departures would cancel out. They lean consistently in the same directions — which is what makes them worth studying, and worth worrying about.
A quarterly earnings beat means little if it doesn't change the story investors are telling about where a company is headed.
Business & Strategy
Profitable companies spend years building things and then hand them out for free. There's a clean piece of economics behind it — and it tells you where you sit in someone else's plan.
Retailers won't join without shoppers; shoppers won't come without retailers. Both are right to wait — and how you break that deadlock defines every marketplace business ever built.
Holding out two weeks for a better house price is worth a fortune to you and pocket change to your agent. No dishonesty required — just a small gap between what you want and what they're paid for.
Colonial Hanoi paid a bounty per rat tail and got a rat-farming industry. The failure needs no dishonesty — only a proxy, a consequence, and someone rational enough to notice the shortcut.
Buying from specialists is usually cheaper, and sometimes it means you cannot be better than anyone else. The right boundary moves as an industry matures — and rarely gets revisited.
An org chart looks like a diagram of authority. It works as a map of which conversations are cheap — and that is what ends up shaping the product.
New methods can only grow by taking resources from old ones. The productivity gain and the displacement are not cause and side effect — they are the same event seen from two sides.
Most attention goes to choosing investments — the part you control least and that matters least. Saving rate, time, and costs decide the outcome, and all three are dull.
A few pea pods produced most of Pareto's peas. The lopsidedness he kept finding everywhere contradicts a default we apply constantly — treating twenty tasks as twenty roughly equal things.
Money spent arrives with a bill. The alternative you silently rejected never does — which is why we count one half of every decision carefully and the other half not at all.
Two shops on one street do everything right; one closes. Quality and effort are what you need to compete at all — a moat is what stops a rival matching you even when they genuinely try.
A lily pad covering a pond on day thirty covered half of it on day twenty-nine. Nothing about its growth changed — only the base it grew from. Human intuition fails at this reliably and expensively.
Before asking how a company makes money, ask what it would have to give up to make more of it.
Small teams don't win because they're scrappy — they win because they can change their mind faster than incumbents can hold a meeting.
Anything a rival can replicate in a product update isn't a real advantage — it's a temporary lead.
Most products improve because someone builds new features. Network-effect products improve because more people simply show up.
The internet didn't just change distribution — it flipped who has the leverage between supply and demand.
Archimedes needed a long enough lever and a place to stand to move the world. Modern leverage doesn't need either.
Computer Science & AI
Claude Shannon's mathematical definition of information: a message carries information in proportion to how surprising it is.
Computing & Information
Earth & Energy
Remove one predator and rivers can change course. The size of a change tells you little — what matters is whether the system amplifies it or absorbs it.
Earth & Space
Billions of stars, billions of years, and enough time for anyone to have crossed the galaxy several times over. We see nothing — and every explanation for that says something significant.
Economics & Finance
David Ricardo's insight that trade benefits both parties even when one is better at everything — because opportunity cost, not absolute cost, is what determines who should produce what.
When two currencies circulate together, people hoard the more valuable one and spend the debased one. Sir Thomas Gresham's 16th-century observation applies far beyond currency.
Thorstein Veblen's observation that some goods sell more as they get more expensive — because the price itself signals status. Luxury markets run on this logic entirely.
Engineering
The obvious response to a slipping deadline is more people. Output falls first, because the only people who can train them are the ones already behind — and coordination grows with the square of the team.
Most engineering time goes on code that already exists. Once you accept that, the practices that look like fussiness turn out to be straightforward economics.
Every complex system that works turns out to have grown from a simple one that worked. Designing the finished version from scratch doesn't just take longer — it has a startlingly poor success rate.
Epistemology & Logic
The meeting you weren't invited to has two explanations that fit equally well. Preferring the boring one isn't generosity — it's what happens when you count how much each explanation assumes.
The colleague who ignored your email is probably not conspiring against you. The principle behind that judgement is arithmetic, not optimism — and it is misquoted more than almost any other rule of thought.
Health & Biology
Humanities & Arts
Physicists assume observation reveals reality; doctors assume suffering is bad. None of those assumptions can be tested by the field relying on them — and someone has to examine them.
Every account is assembled from what survived, by someone who already knows the ending. That single fact makes events look more inevitable than they were — and explains why careful history sounds less certain.
India
Digital public infrastructure, data localization, and platform rules in India increasingly follow a distinct playbook from the US or EU.
The signals that predict a market shift in the US often lag or don't apply at all when read against India's market structure.
Life Sciences
The fossil record shows long stretches where species barely change, then rapid shifts. The interesting question is not why change happens in bursts — it is what holds things still for so long.
Species with identical needs cannot coexist — a small consistent advantage compounds until one is gone. Which means anything living side by side must differ, and finding how is informative.
A population grows until the resource runs short — then often keeps going past the limit. What makes overshoot serious is that it can damage the resource base and leave the ceiling permanently lower.
Your eye has a blind spot no engineer would design. That flaw reveals the process that built it — a process that governs markets and ideas as strictly as it governs retinas.
Lifestyle & Skills
Mathematics & Statistics
Andrei Markov's 1906 model: a system where the next state depends only on the current state, not the full history. Weather models, Google's PageRank, and language models all use this principle.
An ergodic system is one where the average across many people equals the average over time for one person. Most real-world risks aren't ergodic — and ignoring this leads to ruin, even when expected value looks fine.
In a normal distribution, extreme events are vanishingly rare. In a fat-tailed distribution, they're not — and most risk models, built on normal assumptions, dangerously underestimate tail risk.
Media & Culture
Writing's real consequence was not that people could record things — it was that law could outlive its author. Every medium does work that no individual message controls.
Unbundling gave viewers exactly what they asked for — and quietly removed the economics that funded the content in the first place.
A one-person channel with a loyal audience now competes directly with institutions that employ hundreds.
Medicine & Health
If each case produces more than one further case, an outbreak grows; below one, it fades. That threshold is simple — and almost everything else about the subject is context-dependent.
The computer analogy breaks down at the most important point — the hardware physically changes with use. That single property explains most of what is practically known about learning.
The interventions with the largest effects have been known for decades and are unglamorous. Attention flows almost inversely to effect size, for a simple reason — the big ones cannot be sold.
Neuroscience & Biology
Donald Hebb's 1949 rule for how the brain changes with experience. The phrase 'neurons that fire together wire together' summarizes why repetition builds skill, why trauma leaves marks, and why the first time you learn something matters.
Philosophy & Ethics
The ship of Theseus: a thought experiment about identity and continuity — if you replace every part of something, is it still the original?
Hitchens's razor: what is asserted without evidence can be dismissed without evidence.
Physics & Complexity
The four laws of thermodynamics govern energy, heat, entropy, and the direction of all physical processes — from steam engines to black holes.
Sensitive dependence on initial conditions: why tiny differences in starting states produce vastly different outcomes in chaotic systems.
Le Chatelier's principle: when a system in equilibrium is disturbed, it responds in a way that opposes the disturbance and restores balance.
Physics & Reality
Light measures the same speed however fast you are moving. Take that seriously and distance and time have to bend — which is why your phone's position fix depends on the theory working.
Paper on a table will not burn, though burning releases energy. Something has to supply the initial push — and most stalled intentions are barriers, not disagreements about value.
Checking a tyre's pressure lets out a little air, so the reading is never quite what was there before. With objects that hardly matters. With people it can be larger than what you were trying to measure.
An afternoon coffee still has an eighth of its caffeine in you the next morning. Anything that loses a constant proportion per period behaves this way — including skills and knowledge.
Policy & Power
The classic test for monopoly power breaks down the moment the product in question doesn't charge users anything at all.
By the time a law addresses a technology's harms, the technology has usually already moved on to its next form.
Psychology
A fair coin flip for equal stakes feels like a bad bet to almost everyone. The asymmetry behind that instinct quietly governs pricing, negotiation, investing, and why reform is so hard.
Wartime analysts mapped damage on returning bombers and proposed armouring the places full of holes. A statistician pointed out those were the survivable hits — and inverted the entire dataset.
The same behaviour gets explained by character in others and by circumstance in yourself. The asymmetry is not mainly self-flattery — it is what you can and cannot see.
When what you did clashes with what you think, one has to give. The action already happened and the belief is private — so people end up sincerely believing whatever justifies what they did.
The quiet, bookish stranger sounds like a librarian. There are a hundred times more salespeople — so the shy ones alone outnumber every librarian in the country.
The mind doesn't search for the truth by default. It searches for confirmation, and calls whatever it finds the truth.
James Gibson's insight that perception is not about what things are but what they allow you to do. Don Norman applied it to design: a door handle that looks like it should be pushed, pulled, or pushed-slid is an affordance problem.
Abraham Maslow's 1943 pyramid of human needs — physiological, safety, love, esteem, self-actualization. The original research was limited. The framework has been systematically misapplied. And yet it captures something real about how human motivation works.
Psychology & Behavior
The gambler's fallacy: the false belief that past random events influence future independent ones — that after a streak of heads, tails is 'due'.
Science & Math
A rare disease, a 99% accurate test, a positive result — and roughly a 9% chance you're ill. The gap comes from one number most people leave out entirely.
Around thirty per cent of numbers in real datasets begin with 1, and only five per cent with 9. People inventing figures don't reproduce that — which is how the pattern became an auditing tool.
One die is flat. Ten dice added together make a bell curve. The shape is a property of adding independent things — which tells you exactly when to expect it and when not to.
Seven heads in ten flips is unremarkable; seventy thousand in a hundred thousand would be extraordinary. The same probability, different room for chance — with consequences most people miss.
A treatment beats its rival for small stones, beats it for large stones, and loses when you combine the patients. Nothing was miscalculated — which is what makes it worth understanding.
Society & Culture
Society & Politics
Two children share one cake and one child's gain is the other's loss. Two neighbours swap mangoes for apples and both end up better off, with no new fruit. Telling these apart changes what you should do.
Ideas that are ordinary today were once outside the range of what a respectable person said aloud. Mostly the facts didn't change — the boundary of the sayable did, and it moves by repetition.
Every herder who adds a cow to the shared pasture captures the whole benefit and pays a twentieth of the cost. Nobody is greedy, everyone is correct, and the pasture dies anyway.
You can recognise thousands of faces and actively maintain far fewer relationships. The famous figure of 150 is contested — the underlying constraint is not.
Strategy & Power
Clausewitz's center of gravity: the single hub of power whose disruption unravels the entire system.
Systems & Complexity
Car plants stopped worldwide for want of cheap chips, and consumer demand had barely moved. Each tier adds a little caution to what it received, and the additions compound.
You drive through a ten-minute jam and past no accident. The jam was real, it moved backwards down the road, and no car was it. A great deal of the world is built this way.
We label parcels 'fragile' but have no word for the opposite — not strong, which survives shocks unchanged, but something that improves because of them. Your muscles are the everyday example.
Cutting inventory frees a lot of cash. The original reason for cutting it was different — stock conceals late suppliers and broken machines, and removing it forces them into view.
Optimizing anything that isn't the bottleneck doesn't just fail to help — it can quietly make the bottleneck worse.
Technology & Platforms
Control every part and tune the fit, or accept a standard interface and gain interchangeability. Which one wins turns on a single question — and the answer changes as a market matures.
Ten times the users gives roughly a hundred times the possible connections. The exact formula overstates things — the underlying point about compounding leads does not.
The same technology gets overestimated early and underestimated late. Both errors come from drawing a straight line through something that is slow first and rapid afterwards.
Chip design is spread across hundreds of firms. Making the advanced ones happens in very few places — and that single asymmetry explains the shortages, the politics, and the fragility.
Every device company eventually discovers it's actually a services company wearing a hardware costume.
Scale alone doesn't explain platform dominance — control over the interface between supply and demand does.
The interesting story in AI isn't any single model — it's how fast the cost of intelligence is falling.
Nobody thinks about the cloud layer beneath a product — until an outage reminds everyone exactly how much depends on it.
The consumer app graveyard isn't full of bad products — it's full of good products with no reason for anyone to open them twice.