2026年7月6日

API Latency Budget Planner: Why Most Budgets Are Fiction Until You Compare Them to a Trace

By xiezixing 2026年7月6日

A 300 ms P99 budget that ignores OpenTelemetry measurements is a guess with a flag on it. The three decisions every team makes — cold path, warm path, processing — are almost always the wrong ones until the waterfall meets the trace.

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Cron Expression Generator: The Five-Field Decision Nobody Reads on Monday

By xiezixing 2026年7月6日

Six to nine characters decide whether your cron job fires every minute, every workday, or never. Here's the syntax that drives every Unix scheduler, and why a generator matters more than typing speed.

One total four scores — DOTS Wilks 1994 IPF GL and Goodlift compared side by side for an 83 kg raw lifter hitting a 600 kg total

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One Total, Four Scores: DOTS, Wilks, IPF GL and Goodlift Compared

By xiezixing 2026年7月6日

An 83 kg raw lifter hitting 600 kg posts 405 DOTS, 400 Wilks 1994, 88 IPF GL and 88 Goodlift — three different tiers from one total. Here is why the four formulas disagree, what each polynomial actually does, and when to quote which score in programming, meet prep and gym-floor conversations.

Blue Hour Calculator — Plan the 20-minute twilight window for landscape photography

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Blue Hour Calculator: Why Photographers Live by a 20-Minute Window

By xiezixing 2026年7月6日

Predict the precise blue hour window for any location and date — solar elevation math, IANA time zone handling, and a confidence indicator for polar edge cases.

Central Limit Theorem Demonstrator cover — Watch the bell curve emerge from any source distribution

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Watch the Bell Curve Emerge from Anything: Inside the Central Limit Theorem Demonstrator

By xiezixing 2026年7月6日

An interactive visual proof that the distribution of sample means converges to a Normal bell curve regardless of source distribution, plus four controls and four source distributions you can dial in.

JSON-LD Generator from CSV cover showing schema.org JSON-LD output and three validator decisions

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Three Spreadsheet Decisions That Decide Whether JSON-LD Survives the Validator

By xiezixing 2026年7月6日

How the schema.org type, public page URL, and spreadsheet column names decide whether the output JSON-LD earns a Google rich result.