Guides & explainers
The reasoning behind the tools. How percentages actually work, what a loan really costs, why BMI misleads, and how to pick a password that holds up. Written to answer the question, then get out of the way.
Home Is a Smart Meter Worth It?
A smart meter ends estimated bills and shows usage in near real time. It does not reduce your energy use by itself.
Cooking Is an Air Fryer Cheaper Than an Oven?
For one or two portions, yes, by a wide margin. An air fryer heats a small space quickly; an oven heats a large one slowly. Where the saving disappears.
Health What Do Blood Pressure Numbers Mean?
The top number is the pressure when the heart beats, the bottom when it rests. What counts as normal, what raises a reading falsely, and when the numbers matter.
Explainers What Is a Hex Colour Code?
Six characters encoding red, green and blue as three pairs of hexadecimal digits. How to read one at a glance, what the shorthand means, and where the eighth charact.
Work What Is a Probation Period and What Are My Rights?
Probation is a contractual trial period, not a legal status. Your statutory rights apply from day one. What actually changes, and what employers cannot do.
Writing What Is a Regular Expression?
A regex is a pattern that matches text: find every email address, every date, every duplicated word. The syntax that covers most real uses, and where it goes wrong.
Work What Is a Tax Code and How Do I Know If Mine Is Right?
A tax code tells your employer how much you can earn tax-free. 1257L is standard. What the letters mean, which codes signal a problem, and how to get one corrected.
Money What Is an ISA and Which One Do I Need?
An ISA is a wrapper that shelters savings or investments from tax. Four main types, one annual allowance between them, and a straightforward way to pick.
Money What Is National Insurance Actually For?
National Insurance buys entitlement to the State Pension and certain benefits, based on a contribution record rather than the amount paid.
Explainers What Is Standard Deviation?
Standard deviation measures how spread out numbers are around their mean. Small means clustered, large means scattered.
Work What Is Statutory Sick Pay and Who Gets It?
SSP is a fixed weekly amount paid for up to 28 weeks, starting from the fourth day off. Who qualifies, what it pays, and how contractual sick pay differs.
Health What Is the 20-20-20 Rule for Eye Strain?
Every 20 minutes, look at something 20 feet away for 20 seconds. Why screen fatigue is mostly about focus distance and blinking, and what else actually helps.
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