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Upside-Down Text Field Guide: How the Unicode Flip Actually Works
Upside-down text is just per-letter Unicode lookalikes pasted back in reverse order, and that two-step…
GraphQL Playground Field Guide: Five Edge Cases Where the Browser Beats the CLI
Stop installing CLI clients just to test a query. A GraphQL Playground runs entirely in…
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Molar Mass Lookup Field Guide: Atomic Weights That Survive a Lab Bench Audit
Molar mass is just a number — until you ask where it came from. A…
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Remove Duplicate Lines Field Guide: The Five Edge Cases Behind Every “Just Dedup It”
The fastest way to dedupe a long list of lines is rarely a custom script.…
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Mod-11 Checksum Calculator Field Guide: ISBN-10, fodselsnummer, and the X check digit
The Mod-11 check digit is the quiet workhorse behind ISBN-10, ISBT-128 blood bags, Norwegian fødselsnummer,…
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Pressure Calculator & Converter Field Guide: P = F / A and 9 Units in One Tool
The cleanest way to think about pressure is force per unit area, and the cleanest…
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Heading Hierarchy Auditor: A Field Guide to Heading Semantics
The right way to think about heading hierarchy is that visual weight is a side…
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A/B Test Significance Calculator Field Guide 2026-08-12
Stop ending experiment reviews with "p ~= 0.06, ship it" or "5,000 visitors, looks promising"…
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Prompt Optimizer Field Guide: From Rough Draft to Role, Task, Constraints, Few-shot
Prompt Optimizer turns rough, ad-hoc prompts into structured instructions. It scores the original on three…
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Tournament Bracket Generator Field Guide: From Team List to Final Four
A field guide to the Tournament Bracket Generator at Elysia Tools: paste team names, pick single- or double-elimination, and get a properly seeded ASCII bracket with FINALS/SEMI-FINALS/QUARTER-FINALS round labels and BYE padding for non-power-of-two team counts.