baking cooking food
How to convert a recipe between different baking pan sizes
Scale by area, not by width — a 23 cm tin holds a third more than a 20 cm one. What the multiplier covers, and the four things it does not.
ReadGuides & explainers
The reasoning behind the calculators — why the formulas are what they are, and where the common mistakes come from.
privacy images faces
Blurring faces in photos: what automatic detection can and cannot do
Automatic face detection is a starting point, not a guarantee. How it works, the faces it reliably misses, and why padding and effect choice matter more than most tools admit.
Read privacy security images
How to redact an image safely: blur, pixelation or solid coverage?
Blurring and pixelation transform information instead of removing it, and both have been reversed in published research. What actually works, and what still leaks after you have covered the obvious.
Read pdf privacy metadata
What PDF metadata can reveal — and what removing it does not remove
A PDF carries two separate metadata blocks, and stripping them is a narrower operation than most people assume. What is in there, and the five things that survive a clean.
Read grades maths education
How weighted grades and required final-exam scores are calculated
The arithmetic is simple; the assumptions are where grades go wrong. Why an ungraded category must not count as zero, and why a low-weighted exam cannot save you.
Read ascii art terminal unicode
ASCII, ANSI and Unicode art explained
Character brightness ramps, why monospace is non-negotiable, how terminal colour actually works, and the platform formatting problems that break text art.
Read dithering images retro
Floyd–Steinberg, Bayer and Atkinson dithering compared
Error diffusion, ordered dithering and halftones solve the same problem in different ways. What each one does to gradients, edges, file size and animation.
Read text regex data
How to extract emails, URLs and numbers from unstructured text
Pattern matching finds shapes, not verified data. Where extraction goes wrong, why phone numbers are the hardest case, and how to handle the results responsibly.
Read cooking baking food
How to scale a recipe without ruining it
Multiplying ingredients works for most cooking and fails for baking. What scales linearly, what needs judgement, and why cooking time and tin size follow different rules.
Read sprite sheet game dev animation
How to cut and export a sprite sheet
Frame size, spacing, margins and offset — what each one means, why frames drift by a few pixels, and how to handle sheets that do not divide evenly.
Read colour design images
How colour palette extraction works
Why two tools give different palettes from the same image, what dominant and balanced actually mean, and why extracted colours are never a brand’s real ones.
Read pixel art images retro
How to turn an image into pixel art without making it blurry
Shrinking a photo does not make pixel art. What nearest-neighbour scaling, palette reduction and anti-aliasing actually do, and why the export multiple matters more than anything else.
Read security qr privacy
How to read a QR code safely before opening its link
A QR pattern gives no clue where it leads, which is what makes sticker scams work. How to see the real destination first, and what a reader cannot tell you.
Read text writing seo
Word frequency and keyword density: what the numbers actually mean
Frequency counts tell you what a text is made of. They do not measure quality or search relevance. What each number means, and where the SEO myth came from.
Read dev data json
JSON vs YAML vs XML: differences, trade-offs and conversion pitfalls
The three formats are not interchangeable. What each represents natively, where conversion silently loses information, and the parsing risks only two of them carry.
Read pdf print files
PDF crop boxes explained: media, crop, trim and bleed
A PDF page has up to five nested boxes defining what exists, what is displayed and what gets printed. Why cropping hides content instead of deleting it.
Read pdf security encryption
PDF password protection explained: encryption vs permissions
A PDF can be encrypted so it cannot be opened, or merely flagged "do not print". Only one of those is protection. Here is the difference and why it matters.
Read images privacy exif
What photo metadata can reveal — and how to remove it
Photos carry EXIF, IPTC and XMP metadata; GPS coordinates, camera serial numbers, timestamps. What each standard stores, and how to remove them properly.
Read dates time business
Business days vs calendar days: why "within 10 days" is ambiguous
Ten business days can span more than two calendar weeks. How business-day counting works, where weekends differ worldwide, and the counting traps in contracts.
Read dev security encoding
Base64 is not encryption (encoding, encryption and hashing, untangled)
Encoding, encryption and hashing all turn data into gibberish, and they solve completely different problems. What each one guarantees, and where each gets misused.
Read dev cron time
Cron syntax explained: reading the five fields without a cheat sheet
Cron expressions like 0 3 * * 1 pack a schedule into five fields. How to read them, the day-of-month vs day-of-week trap, and the mistake that fires 60 times.
Read money math interest
Compound interest, mechanically: what "interest on interest" really does
The compound interest formula, why compounding frequency matters less than people think, the rule of 72, and how the same mechanics work against you in fees.
Read loans money math
How loan amortisation actually works (why early payments are mostly interest)
Equal monthly payments hide a shifting split between interest and principal. The mechanics of the amortisation formula, explained step by step with a worked example.
Read dev security jwt
How to read a JWT (and what the three parts actually do)
A JSON Web Token is three Base64 sections split by dots, readable by anyone and forgeable by no one. How the format works, the claims, and the classic pitfalls.
Read images compression
JPEG vs PNG: a practical rule that covers almost every case
One format is built for photographs, the other for sharp edges and transparency. How each one compresses, where each one fails, and a rule of thumb that rarely misses.
Read files units storage
MB vs MiB: why a 1 TB drive shows up as 931 GB
Drive makers count in powers of 1000, operating systems in powers of 1024. Nobody is lying. The maths behind the missing gigabytes, and what KiB and MiB mean.
Read cooking units conversion
Ounces vs fluid ounces: they are not the same unit
An ounce measures weight, a fluid ounce measures volume, and they only coincide for water. Why "8 oz of chicken" and "8 oz of milk" are different kinds of quantity.
Read math percent statistics
Percent vs percentage points: a small wording difference that changes the number
An interest rate rising from 2% to 3% is one percentage point, and also a 50% increase. Why the two phrasings differ, and the percentage traps hiding in everyday claims.
Read pdf files ocr
Scanned PDF vs text PDF: why you sometimes cannot copy the text
Some PDFs let you select and search text, others behave like photos. The difference is the text layer — what it is, how to check for it, and what OCR actually does.
Read cooking baking units
A cup is not a cup: US, UK, metric and Australian cups compared
A US cup is 236.6 ml, a metric cup is 250 ml, and an old UK cup is 284 ml. Why the same recipe measures differently by country, and when the gap actually matters.
Read dates time iso-8601
Week numbers explained: why your week 1 is not my week 1
Europe plans by week numbers, but ISO 8601 and US conventions disagree about week 1, and some years have 53 weeks. How the numbering systems actually work.
Read images pdf print
What DPI actually means (and which number to pick)
72, 96, 150, 300 — DPI settings decide between blurry prints and bloated files. What the number controls, and which value fits screen, print and OCR.
Read dates time
What "one month later" actually means (dates are harder than they look)
What is 31 January plus one month? There is no single right answer. How month arithmetic works, why software clamps dates, and where the edge cases bite.
Read dev security files
What checksums are for: verifying a download with a hash
Sites publish SHA-256 hashes next to downloads for a reason. What a checksum proves, what it cannot prove, how to check one on any OS, and why MD5 still exists.
Read pdf files compression
Why compressing a PDF sometimes makes it bigger
PDF compressors shrink scans dramatically and can inflate text documents. The difference is what the PDF stores inside, and here is how to tell before you compress.
Read time dates timezones
Why time zone conversion is harder than adding hours
UTC offsets change with the calendar, half-hour zones exist, and DST switches on different dates worldwide. Why fixed-offset arithmetic is only usually right.
Read mortgage loans interest
What an extra €100 a month actually does to your mortgage
Overpaying a loan saves far more than the amount you overpay. Here is why the effect is non-linear, and how to work out the saving for your own loan.
Read baking cooking conversions
Why a cup of flour and a cup of honey are not the same weight
A cup is a volume, a gram is a weight, and the bridge between them is density. Here is what a cup of each common baking ingredient actually weighs.
Read vat tax invoicing
How to remove VAT from a price (and the mistake almost everyone makes)
Removing VAT is not the same as subtracting the VAT percentage. Here is the correct formula, why the intuitive method is wrong, and how much it costs you.
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