Activation Energy: Favourable Is Not the Same as Likely
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.
Concept
Feedback Loops
Fundamental Attribution Error: They Are Impatient, You Were Late
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.
Organizational Design: Choosing What Will Be Easy to Build
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.
Punctuated Equilibrium: The Puzzle Is the Stability, Not the Change
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.
Epidemiology: Everything Turns on One Number Crossing One
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.
Ecology and Climate: Feedbacks Decide the Outcome
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.
Neuroscience: The Brain Rearranges Itself Around What You Do
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.
Carrying Capacity: The Ceiling That Can Be Lowered
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.
Emergence: The Traffic Jam That Nobody Caused
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.
Antifragility: The Things That Get Better When You Drop Them
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.
The Tragedy of the Commons: When Restraint Is Punished
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.
Compound Interest: The Pond Was Empty Until It Wasn't
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.
Goodhart's Law: What Happens the Moment You Attach Money to a Number
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.
The Amplification of Panic: The Bullwhip Effect and Supply Chain Volatility
A five percent shift in consumer demand stopped the world's car factories. The distortion happens on the way upstream — and it is entirely rational at every step.
Network Effects: The Only Moat That Deepens While You Sleep
A lone fax machine was a paperweight. The machines never improved — the network did. That distinction separates genuine network effects from the many businesses that merely have a lot of customers.
Feedback Loops: Why Structure Beats Effort Every Time
A shower with a four-second lag will defeat anyone. The oscillation is a property of the loop, not the person — and most organisational dysfunction works exactly the same way.
The Illusion of Local Optima: The Theory of Constraints and Systems Bottlenecks
A factory running at 98% capacity can still fail to deliver. Optimising everything except the bottleneck is not progress — it is an expensive illusion.
Conway's Law: Your Architecture Is an X-Ray of Your Org Chart
Assign four teams to build a compiler and you get a four-pass compiler. The seams in any system fall exactly where the seams between its builders already were — and rewrites that ignore this get undone.
Hormesis: The Dose Decides Whether It Helps
Lifting weights tears muscle, and the tearing is the point. A small dose of something harmful can trigger a repair response that leaves you stronger — but only under two specific conditions.
Power Laws: When the Average Describes Nobody
The world's tallest person barely moves a room's average height. The world's wealthiest moves it by a factor of millions. Almost all statistical intuition is built for the first case.
Technical Debt: The Loan Nobody Remembers Taking
Cunningham's metaphor was never about bad code. It was about a rational trade — ship now, pay interest later — and the interest is levied on every future change you make.