2026年9月20日

LDL-C Calculator (Friedewald) Field Guide: When Three Inputs and a 5-to-1 TG:VLDL Ratio Drive Fifty Years of LDL-C Math — And Quietly Underestimate at the Edges That Matter

By xiezixing 2026年9月20日

Three numbers and a constant: how Friedewald's 1972 formula still drives every lipid panel — and the five edge cases where it silently underestimates LDL-C by 15-25%.

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Recipe Ingredient Scaler Field Guide: When Parsing, a 70-Entry Density Table, and Smart Seasoning Beat the Generic Multiplier

By xiezixing 2026年9月20日

A recipe written for 4 servings does not survive being doubled by 4 if you…

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Rotate 25 Unit Cells and See Coordination: A Field Guide to the Crystal Structure Explorer

By xiezixing 2026年9月20日

A static picture of NaCl is not the same as seeing it. A rotatable ball-and-stick…

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XLSX CSV Batch Converter Field Guide: When Three Encoding Choices, Two Delimiter Slugs, and One Mode Switch Decide Whether Your Spreadsheet Lands at 47 KB or 1.2 MB

By xiezixing 2026年9月20日

Lead phrase. Batch conversion between CSV and XLSX looks like one toggle until you add…

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AI Domain Name Idea Generator Field Guide: When Seven Inputs, One RDAP Check, and One Naming-Style Choice Decide Whether Your Brand Lands a Free .com or a 30-Round Refund

By xiezixing 2026年9月20日

Lead phrase. Choosing a domain name used to mean opening a registrar, typing your favorite…

Z85 RFC 1924 Base85 Stream Encoder Decoder Field Guide: When Three Alphabets Hide Behind “Base85”

By xiezixing 2026年9月20日

Z85, RFC 1924, and "Base85" are three different alphabets wearing the same name. You encode…