Master your workflows.
Deep dives into mathematical calculations, data formatting structures, and local browser processing updates.
Health & FitnessWhere BMI Came From, and Why 25 Became the Line
An index built in the 1830s to describe populations, renamed in 1972 and redrawn in 1998. This is general information, not medical advice.
FinanceWhere the EMI Formula Comes From
Deriving the instalment formula from month-by-month arithmetic, and using it to turn a flat rate into a real one.
FinanceThe Cascade That Value Added Tax Was Built to Stop
What happens to a supply chain under a simple turnover tax, why the invoice-credit fix works, and why zero-rated and exempt aren't the same thing.
Developer UtilitiesWhat Counts as Valid JSON
Two standards define the same format, and they disagree at the edges. Here are the ambiguities that real parsers handle differently.
Security & PrivacyWhat Browser-Only Processing Protects
In-browser file processing means no upload and no server-side copy. It doesn't mean encrypted, offline, or free of third-party scripts.
Image OptimizationThe Photo Format Your Phone Never Sends
JPEG, PNG, WebP, HEIC, AVIF and JPEG XL, and how patent licensing rather than compression decided which ones browsers would open.