Guides
Longer explanations of the questions behind the tools — what the numbers mean, where the conventions came from, and how to decide when the answer isn't just arithmetic.
Cooking Measurement Conversions (and Why Cups Are a Problem)
Why volume measurements fail for dry ingredients, gram weights for the ingredients you actually use, and a full oven temperature table including gas marks and fan ovens.
· 10 min read
Working With Time Zones Without Getting It Wrong
The handful of time zone facts that prevent almost every scheduling mistake — plus why storing a UTC offset instead of a zone name is a bug waiting to happen.
· 10 min read
GPA Explained: Weighted, Unweighted, and What Colleges Actually Look At
The grade point formula worked through step by step, why an AP class can push you past 4.0, and what admissions offices do with the number when they recalculate it themselves.
· 9 min read
How to Make a Genuinely Fair Random Choice
Physical randomness is subtly biased and naive code is worse. What actually makes a random pick fair, and how to run a draw people will trust.
· 9 min read
Password Strength Explained: Why Length Beats Complexity
Entropy in plain terms, why a long simple password beats a short complex one, and which pieces of traditional password advice current NIST guidance now contradicts.
· 9 min read
How Long Should It Be? A Word Count Guide for Essays, Blogs, Speeches and Novels
Target lengths for every common kind of writing, how word count maps to pages, and how long a given count takes to read silently or deliver out loud.
· 9 min read
How Much Should You Tip? A Practical US Guide by Service
Standard US tipping percentages for every common service, why 20% became the restaurant default, and how to handle service charges, delivery fees and split bills.
· 8 min read