How you explain what you know decides whether that knowledge is worth anything to the person standing in front of you. I’ve sat in meetings where the smartest person in the room said absolutely nothing useful, not because they didn’t understand the problem, but because they explained it in a way only they could follow. And I’ve watched a junior employee, who knew a fraction of what the expert knew, win the whole room over in five minutes flat because they knew how to make the idea land. That gap between knowing and explaining is where most good ideas quietly die.
We’re taught from school onward that knowledge is the prize. Get the degree, read the book, collect the certification, and the rest takes care of itself. Nobody really teaches us the second half of that equation: knowing something and making someone else understand it are two completely different skills, and one doesn’t automatically produce the other.
Why Smart People Struggle to Explain Simple Things
There’s a well-documented psychological pattern behind this, and it isn’t a personality flaw; it’s just how the brain works once it learns something. Psychologists call it the curse of knowledge. In 1990, a Stanford psychology graduate student named Elizabeth Newton ran a now-famous experiment to study exactly this. She split participants into two groups: “tappers” and “listeners.” Tappers picked a well-known song from a list of 25 tunes, things like “Happy Birthday” and “Twinkle Twinkle Little Star,” and tapped its rhythm out on a table. Listeners had to guess the song from the taps alone.
Before the listeners guessed, Newton asked the tappers one question: What percentage of listeners do you think will get it right? The tappers predicted around 50%. The actual result, across 120 songs tapped out, was just 2.5%, only three correct guesses in the entire experiment.
Here’s what makes the study so revealing: while a tapper taps, they can’t help but hear the full melody in their head, complete with instruments and lyrics. The listener, meanwhile, hears nothing but disconnected knocks on a table. The tapper’s knowledge of the song made it almost impossible for them to imagine what it sounded like to someone who didn’t already know it.
That’s the trap. Once you know something, you genuinely cannot remember what it felt like not to know it. This is why a doctor rattles off medical terminology to a worried patient without realising they’ve lost them at the second sentence, why an engineer explains a bug fix to a client using acronyms nobody outside the team recognises, and why a manager assumes their team understood instructions that were, in the manager’s own head, clear.
Knowing Something Doesn’t Mean You Can Teach It
There’s a popular quote floating around the internet that goes something like, “If you can’t explain it simply, you don’t understand it well enough,” usually attributed to Albert Einstein. Worth knowing: there’s no real record of Einstein ever saying it, and it’s often mistakenly credited to physicist Richard Feynman as well. The line makes a tidy motivational poster, but it actually oversimplifies something more interesting.
Feynman himself, famous for his gift for teaching complex physics in plain language, once admitted something far more honest. When a colleague asked him to explain, at a beginner level, why a certain class of particles behaves the way it does, Feynman said he’d prepare a freshman lecture on it. A few days later, he came back and said he couldn’t do it. He couldn’t bring the explanation down to that level, and he took that as a sign that even physicists at the highest level hadn’t fully cracked the concept themselves.
That’s a more honest picture than the fake Einstein quote. Understanding and explaining are related, but they’re not the same skill, and even brilliant people sometimes hit a wall between the two. The upside is that explaining forces a kind of understanding you can’t get any other way. Trying to teach a concept to someone else, or even to a blank page, exposes exactly where your own grasp of it gets fuzzy. That’s the entire logic behind study techniques where you explain a topic out loud in plain language and circle back to the parts where you stumble.
What Actually Makes an Explanation Land
If the curse of knowledge is the disease, the cure isn’t complicated, but it does take deliberate effort. A few things consistently separate explanations that land from ones that don’t:
Start from where your listener actually stands, not from where you stand. The tapper’s mistake wasn’t a lack of knowledge; it was forgetting that the listener didn’t share it. Before explaining anything, it helps to ask what the other person already knows and build from there instead of your own starting point.
Concrete language beats abstract language every time. “Our churn rate increased” is technically accurate and instantly forgettable. “We’re losing one in five customers within their first three months” makes people sit up. Numbers, comparisons, and real examples stick where abstractions slide right off.
Stories and analogies do the heavy lifting that jargon can’t. When you connect a new idea to something the listener already understands, you’re not dumbing it down; you’re giving their brain a hook to hang the new information on.
Short sentences and plain words aren’t a sign of weak thinking. If anything, the ability to compress a complicated idea into a few clear words is usually a sign you understand it deeply enough to strip away everything that isn’t essential.
Check for understanding instead of assuming it. A tapper never got feedback mid-tap about whether the listener was following along. In real conversations, you can. Asking “does that make sense so far?” or watching someone’s face for confusion costs you nothing and saves everyone the trouble of a conversation that goes nowhere.
Why This Matters More Than Ever
We live in a time where information is genuinely cheap. Anyone can look up a fact, a formula, or a definition in seconds. What’s actually scarce and valuable is the ability to take that information and make it useful to another human being who doesn’t have your background, years of experience, or mental shortcuts. A doctor who can’t explain a diagnosis in plain terms leaves a patient scared and noncompliant. A teacher who can’t break a concept down leaves a classroom of kids convinced they’re bad at the subject, when really, the explanation just didn’t meet them where they were. A founder who can’t explain their product in one clear sentence loses investors who might otherwise have said yes.
Knowledge without the ability to transmit it stays locked inside one person’s head, and that’s a waste, both for the person holding it and for everyone who could have benefited from it. The people we remember as great teachers, great leaders, and great communicators usually weren’t the ones who knew the most. They were the ones who could take what they knew and hand it to someone else without losing anything important along the way.
Conclusion
What you know absolutely matters; nobody’s arguing that expertise is optional. But knowledge that stays trapped behind jargon, assumptions, and the curse of knowledge might as well not exist for the person trying to understand it. How you explain what you know is the real multiplier. It’s the difference between a brilliant idea that dies in a meeting room and one that gets funded, between a lesson that confuses students and one that changes how they see a subject, between advice that gets ignored and advice that gets followed. If you want your knowledge to actually matter to someone else, the work isn’t done once you understand something. It’s done once you can hand that understanding to another person, in their language, standing where they stand. That’s the harder skill, and it’s the one worth building on purpose.
