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Practical guides covering developer tools, health metrics, SEO, converters and more — written to be actually useful.
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Word Boundaries and Lookarounds: Precise Find & Replace
Why a Kettle Is 95% Efficient and a Power Station Is 45%
A kettle is 95% efficient and a power station is 45%. That's not engineering quality — it's the second law of thermodynamics, and it explains heat pumps too.
Flat Rate vs Reducing Balance: The Same 7% Costs Double
A "7% flat rate" loan costs nearly double a 7% reducing-balance loan. Here's how to spot flat-rate quoting, what APR actually includes, and how to compare offers.
Your Due Date Is a Distribution, Not a Deadline
Only about 4% of babies arrive on their due date. Here's what the birth timing distribution actually looks like, why early term and full term differ, and how to plan.
Why 31 January Plus One Month Has No Right Answer
Adding one month to 31 January has no correct answer, and "add one day" isn't "add 24 hours". The date arithmetic edge cases that break calendars and billing systems.
Why You Can't CNAME Your Root Domain (and What to Do)
A CNAME excludes every other record at the same name, which makes it impossible at a zone apex. Here's why, what breaks when you force it, and how ALIAS records work.
Your Fixed Deposit Is Only Guaranteed Up to a Point
Deposit protection is per banking licence, not per brand — and it includes accrued interest. Two ways a large fixed deposit ends up partly unprotected by accident.
Why 20 MB of Files Takes Up 400 MB of Disk Space
100,000 files of 200 bytes each can consume 400 MB. Cluster sizes, slack space and filesystem metadata explain the gap between file size and space on disk.
Your Subdomains Aren't Protected: The DMARC sp= Tag
A domain at p=reject can still leave every subdomain wide open. The sp= tag decides, and an sp=none set during rollout is one of the most common lingering gaps.
Multiple DKIM Signatures: Which One Actually Counts?
A message can carry several DKIM signatures, and the one that validates isn't always the one DMARC needs. Here's how alignment decides which signature actually counts.
EUR/USD or USD/EUR? Reading Currency Quotes Correctly
EUR/USD 1.0850 and USD/EUR 0.9217 are the same rate — but inverting a rounded quote costs you money. Base/quote conventions, cross rates and rounding rules explained.
Why 0 0 1 * 1 Runs 63 Times a Year: The Cron OR Trap
Cron ORs the day-of-month and day-of-week fields, so 0 0 1 * 1 runs 63 times a year instead of once. That plus step-value gaps explains most cron scheduling bugs.
Every Image Has Alt Text and the Page Is Still Unusable
A page can have alt text on every image and still be unusable with a screen reader. The patterns that pass automated checks and fail real users — and how to audit for them.
