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The DR Tutoring Blog

Ideas worth thinking about,
for students & parents

Psychology, study science, sport, and philosophy — written to make you think differently about how learning actually works.

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Philosophy & Psychology

The Dunning-Kruger Effect

Why knowing a little can make you think you know everything — and what it means for HSC students who assume they've got a topic locked in.

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Maths

The Spacing Effect

Why cramming works short-term but fails you in the HSC — and what to do instead to make knowledge actually stick months later.

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Maths

Why Teaching Someone Else Is the Best Way to Learn

The protégé effect — why explaining a topic out loud reveals gaps that silent studying completely hides.

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Philosophy & Psychology

Nature vs Nurture: Is Talent Born or Built?

One of the oldest arguments in sport and education — and what the research actually says about natural ability versus deliberate practice.

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Philosophy & Psychology

The Paradox of Choice

Why more options make decisions harder, not easier — and what it means for subject selection, uni preferences, and even what to watch tonight.

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Philosophy & Psychology

The Myth of Sisyphus: Why Pushing the Boulder Might Be the Point

A Greek myth, a French philosopher, and what it actually means to push through Year 12 when the boulder keeps rolling back down.

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Sport

Why Does Home Advantage Actually Exist?

Crowd noise, referee bias, travel fatigue — the real reasons home teams win more, backed by data from Covid-era matches played in empty stadiums.

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Philosophy & Psychology

Why Chess Grandmasters Ignore the Numbers Beginners Obsess Over

Grandmasters happily sacrifice their queen for a pawn. It looks like madness — until you understand what they're actually reading.

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Business & Economics

When Google Tried to Sell Itself for Under $1 Million

In 1999, two Stanford students tried to give away what would become a trillion-dollar company. The buyer who said no wasn't an idiot — and that's the whole point.

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Science & Engineering

How Noise-Cancelling Headphones Fight Sound With Sound

They don't block noise — they create the exact opposite sound to cancel it out. Silence, manufactured by adding more sound. Here's the physics behind it.

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Science & Engineering

How Do Aeroplane Wings Lift a 90-Tonne Aircraft Off the Ground?

The explanation almost everyone learns is wrong. NASA's own researchers say so. Here's what's actually happening — and why the real answer is far more interesting.

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History

Why World War 1 Started Over an Assassination That Almost Didn't Happen

The Archduke survived the first attempt. The assassin had given up and was buying a sandwich. Then a driver took a wrong turn — and 20 million people died.

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History

The 38 Minutes That Nearly Ended the World

A Soviet submarine, a nuclear torpedo, a captain who gave the order to fire, and one officer who said no. The full story wasn't confirmed until 2002.

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History

The Race to the Moon: What It Was Really About and What It Cost Both Sides

It wasn't about the moon. It was about nuclear weapons, national prestige, and mutual fear — and the interest in the moon largely evaporated the moment the race was won.

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History

The Chernobyl Disaster: What Actually Went Wrong

A safety test, a design flaw the Soviets had classified, and an official explanation that took decades to fully unravel. What actually happened on April 26, 1986.

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History

The Magna Carta: Why a Document Signed Under Duress Became the Foundation of Modern Democracy

King John signed it to stop a rebellion and immediately tried to have it annulled. Eight centuries later it's in the US Constitution.

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History

Why the Roman Empire Really Fell — And Why the Answer Is Still Debated

Barbarian invasions, economic collapse, climate change, pandemic disease. Historians have been arguing about this for 250 years and still don't fully agree.

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Sport

The NRL Salary Cap and Why It Changes Everything

Every signing, every retention battle, every player who walks out the door — it all comes back to the cap. And with the PNG Chiefs arriving in 2028, the salary cap debate is about to get a whole lot more complicated.

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Sport

Why the Fastest Car Doesn't Always Win

Teams spend up to $500 million a year just to show up. Then a strategist with four seconds to make a call can undo all of it — or win the championship from fifth place.

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Sport

Why Clay, Grass and Hard Courts Produce Completely Different Champions

Same sport, same racket, completely different physics. Here's why Nadal won Roland Garros 14 times but only Wimbledon twice — and what the surface actually does to the ball.

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Sport

How the NFL Became the Most Profitable Sports League on Earth

Over $20 billion in annual revenue, from a sport played seriously in one country. The secret isn't the game — it's the financial model built around it.

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Study & Learning

Sleep and Memory: Why Pulling an All-Nighter Before an Exam Is One of the Worst Things You Can Do

Staying up to cover more ground feels responsible. It isn't. Here's what sleep actually does to memory — and why a rested brain beats a tired one every time.

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Business & Economics

The Sunk Cost Fallacy: Why We Keep Investing in Things That Aren't Working

Staying in a bad situation because of how much you've already put in is one of the most common thinking errors there is. Here's why it happens and how to catch it.

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Business & Economics

Supply and Demand: Why Your Favourite Artist's Tickets Sell Out in 30 Seconds

Millions flood the site, most walk away empty-handed, and the same tickets appear on resale for triple the price. This is basic economics playing out in real time.

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Sport

The Hot Hand Fallacy: Does Being "On Fire" Actually Mean Anything?

Players, coaches and commentators swear by it. Statisticians spent decades saying it wasn't real. Then the statisticians found a flaw in their own analysis.

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Sport

Why Penalty Shootouts Are Won Before the First Kick Is Taken

Penalties are called a lottery. The data disagrees. The 2026 World Cup showed once again that preparation and psychology matter far more than luck.

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Study & Learning

Active Recall vs Passive Review: Why Highlighting and Re-Reading Feel Productive but Barely Work

Re-reading feels productive. The content looks familiar by the end. And almost none of it will be there when the exam comes around. Here's why — and what to do instead.

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Study & Learning

The Forgetting Curve: Why You Lose 70% of What You Learn Within 24 Hours

Within 24 hours of learning something new, the average person forgets roughly 70% of it. Not because they weren't paying attention. Just because that's what memory does by default.

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Business & Economics

Compound Interest: The "Eighth Wonder of the World" Hiding in Plain Sight

$1,000 at 10% a year doesn't just double — by year 40 it's over $45,000. The maths is simple. The reason it feels impossible is that our brains are wired to think in straight lines.

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Maths

The Secret Number Code Hiding in Flowers, Pinecones, and Seashells

A number pattern so simple a primary school kid could build it keeps showing up everywhere in nature — and scientists have a genuinely good explanation for why.

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Science & Engineering

Galloping Gertie: The Bridge That Tore Itself Apart in the Wind

In 1940 a brand new suspension bridge collapsed in ordinary winds. It wasn't a freak storm. The bridge destroyed itself — and the reason why changed engineering forever.

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Science & Engineering

Why Triangles Are Everywhere: The Engineering Trick Hiding in Plain Sight

Bridges, cranes, bike frames — they all rely on the same shape. It turns out triangles aren't just common in engineering. They're geometrically impossible to collapse.

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Maths

The Birthday Paradox: Why 23 People Is Enough to Bet On

Put 23 random people in a room and there's a better-than-50% chance two of them share the same birthday. Here's why your gut instinct about this is completely wrong.

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Maths

The Coastline Paradox: Why "How Long Is Britain's Coastline?" Has No Real Answer

Depending on how you measure it, the same coastline can come out anywhere from a few thousand kilometres to technically, infinitely long.

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Business & Economics

How Henry Ford Accidentally Built the Middle Class

In 1908 a car cost what an average worker earned in a year. Ford's assembly line changed that — but the bigger accident was what happened to wages, and what that did to the entire economy.

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Study & Learning

What HSC Markers Actually Look For

Demystifying the marking process — what "demonstrates understanding" really means, and the specific things that push a response from Band 4 to Band 6.

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Study & Learning

Standard vs Advanced Maths — Which Should You Pick?

The real difference in content, how it affects your ATAR, and an honest framework for making the decision that's right for you.

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Study & Learning

Why Practice Exams Are Your Most Underrated Study Tool

The science of retrieval practice and why testing yourself beats re-reading notes every time — and how most students use past papers wrong.

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Study & Learning

How to Build a Study Timetable That Actually Works

Why most timetables fail within a week, and a practical framework for building one around your actual life — not an idealised version of it.

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Study & Learning

The Psychology of Exam Anxiety

What's actually happening physiologically when anxiety hits, why it affects some students more than others, and what the research says actually helps.

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Business & Economics

Why Netflix Nearly Went Bankrupt

The Qwikster disaster of 2011 — what they did, why it almost killed them, how they recovered, and what it teaches about brand loyalty.

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Maths

The Mathematics of Tournament Brackets

Why upsets are mathematically inevitable, the probability of a perfect bracket, and what knockout tournaments reveal about randomness in sport.

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Science & Engineering

How GPS Actually Works

Triangulation, atomic clocks, and the part nobody expects — why GPS only works because Einstein's theory of relativity is accounted for in the satellites.

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Maths

The Monty Hall Problem — Why Switching Is Always Right

Three doors, one car, one host who knows where it is. The answer breaks people's brains — and reveals how badly humans handle probability.

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Maths

Why 0.999... Equals 1 (And Why People Refuse to Believe It)

It's not approximately 1. It's not basically 1. It is exactly 1 — and the proofs are simpler than you think.

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Philosophy & Psychology

Why We're Bad at Predicting What Will Make Us Happy

The impact bias, focalism, and why we consistently overestimate how much positive events will improve our lives.

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Philosophy & Psychology

The Prisoner's Dilemma and Why It Explains Almost Everything

Why individual rationality produces collective disaster — and what game theory reveals about arms races, price wars and climate change.

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Business & Economics

How McDonald's Makes Its Real Money (It's Not Burgers)

The real estate empire hiding inside the world's most famous fast food chain — and why their first CEO said they weren't in the food business at all.

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Business & Economics

The Economics of Formula 1

Budget caps, constructor payments, and why Ferrari's business model is completely different from every other team on the grid.