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Real problems, worked through

Longer pieces that dig into one situation properly, then link straight through to the calculator built for it - not a landing page for a tool, a genuine answer first.

Credit cards
Credit cards on a marble surface
Four finance sites. One debt. Answers from 10 years to 45.
why-credit-card-payoff-answers-differ.html
Published answers to how long minimum payments take disagree by decades, and all of them can be right. The reason sits in a line of your card agreement that almost nobody reads.
With the three structures run side by side
Mortgages
A model house beside a set of keys
How does an offset account actually work?
how-does-an-offset-account-work.html
Savings, or a repayment? The money stays yours and stays accessible. What it actually does to your interest, with the mechanics sourced from the RBA.
The pillar guide
A model house on a calculator next to a piggy bank
Offset account or extra repayments?
offset-account-vs-extra-repayments.html
The interest maths is identical. The real difference is access, discipline and what happens if you need the money back.
Offset series
Folding rulers and a tape measure above a small wooden house
Same rate, different payment: what your lender never says about compounding
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Two borrowers, both at 5% on $500,000, paying $14.93 a month apart. The gap runs from $1,449 to $12,904 depending on the rate. And no, Canada does not mandate semi-annual compounding.
Computed across six rates, with the primary sources
Kitchen
Copper measuring cups stamped 250 mL
A cup is five different volumes. Nobody tells you which one.
cup-measurements-by-country.html
200, 236.59, 240, 250 or 284.13 mL depending on who wrote the recipe. Australia is the only country with a 20 mL tablespoon, which makes the rule everyone quotes wrong by 28%.
Every standard traced to the instrument that defines it
Bacon-wrapped stuffed chicken thighs on a dark plate
What the food safety agencies actually say about air fryers
air-fryer-food-safety.html
The CDC found nearly a third of people air fry frozen stuffed chicken, which contains raw poultry. Consumer Reports found models running 67F below their own setting. Why the cooking charts cannot keep you safe.
With the manufacturer conversion rules compared
Sport & speed
A Formula car at speed, panned
Zandvoort's banking is 18 degrees. That is steeper than it sounds.
zandvoort-banking-how-steep.html
Eighteen degrees converts to a 32% gradient, and the corner before it is 34.4%. The steepest street on earth is 34.8%. What that means for the last Dutch Grand Prix.
With every banking angle converted to a road gradient
A Formula car at speed, panned
How fast do F1 cars actually go?
f1-car-speed-kmh-mph-explained.html
378 km/h is the real record, not the number most people repeat. The verified top speeds, the 2025 records, and how fast F1 has actually gotten since 1950.
First in an ongoing series on km/h and mph