Singapore's passport photo rules come in pixels and millimetres that never meet
ICA gives the upload in pixels and the print in millimetres, in separate documents that never refer to each other. Joine...
Guides & How-tos · Worked examples · Real numbers
Do it right, with real numbers
Step-by-step how-tos, head-to-head comparisons and honest roundups — every guide worked through with current figures, then backed by a RECATOOLS calculator or AI-directory entry so you can act on it.
510 guides published
17 topic areas
Latest guide Oct 2026
Statistics
35
Health & Wellness
33
Cybersecurity
30
Business
19
Privacy & Data
17
Consumer Tech
14
ASEAN Tech
13
Personality
9
Cloud & Infra
8
Cyber Threat Intel
7
Sustainability
5
Advertisement
A Ziwei chart is four numbers and some arithmetic
The static chart is a function of the year stem, the lunar month, the lunar day and the birth hour. Locating the Life Pa...
Most of a Chinese almanac entry is arithmetic, and the rest disagrees
The day's stem and branch, officer, mansion and clash all follow from the date by formula. The suitable and avoid lists...
Two temples print the same Guanyin oracle and not one of its hundred poems matches
The Guanyin oracle is a set of a hundred numbered poems, drawn by lot in temples across Hong Kong, Taiwan and Singapore....
Following S$10,000 through a Singapore T-bill auction
A Singapore T-bill's headline rate looks directly comparable with a fixed deposit's. Following S$10,000 through the Sept...
Four governments publish stroke order and only one publishes the rules
Taiwan publishes seventeen numbered principles. The mainland publishes 8,105 per-character orders and no principles at a...
Stripping the dots from an email address can merge two different people
Only Gmail's consumer domain and Proton document dots as ignorable. On Google Workspace dots change the address, so two...
How Cangjie turns a Chinese character into five keystrokes
The 24 Cangjie keys are abstract shapes rather than the characters printed on them, and the five-code limit is derived f...
Two published rules for the new moon disagree about one month in three
MABIMS and Muhammadiyah's wujudul hilal are both published and computable a year ahead. Worked through fourteen lunation...
The payment QR on the counter is a line of text you can read
ASEAN merchant payment codes all use one published format: a flat string of tag, length and value. Decoding a real paylo...
Two ASEAN countries tie your broadband to the speed you were sold, and only one checks
Malaysia requires 90% of your subscribed fibre speed and collects the results quarterly. Thailand sets 70% of the advert...
A helmet can meet the standard Philippine law names and still be illegal there
The Philippines, Malaysia and Indonesia all build their helmet rules on the same UN regulation, but only Malaysia accept...
Advertisement