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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.

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.

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. From the Tigers losing Latu Fainu to Melbourne's stripped premierships, here's how the cap reshapes the entire game.

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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.

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.