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TSH Tells You Almost Nothing Without FT4 — A Field Guide to Reading the Thyroid Index the Way Endocrinologists Do
A TSH of 5.8 on its own looks like hypothyroidism. Read alongside a normal FT4,…
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MVT Mapbox Vector Tile PMTiles Auditor Field Guide: When MoveTo, LineTo, and ClosePath Lie About Topology
Close-first: Vector tiles look simple until the third MoveTo command flips a ring and your…
Geocache Letterbox Munzee Stage-Cache Puzzle-Hunt Coordinate Validator Field Guide: When Five Encodings, One Input Box, and the 30-Meter Checker Threshold Decide Whether the Hunt Closes Clean
A field-stamped geocache is not a problem you can solve with a single math call. Five encodings hide behind one hobby: a base-31 GC-code, a 1-to-5 D/T grid, a multi-stage haversine projection, a 30-meter checker threshold, and a type-specific tolerance for letterbox and munzee variants. The Geocache Letterbox Munzee Stage-Cache Puzzle-Hunt Coordinate Validator at Elysia Tools puts all five on a single page and tells you which type your cache is before it tells you whether your answer is right.
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BLS Threshold Signature Aggregation + DKG Field Guide: When One Rogue Key Forges the Whole Aggregate
BLS signatures are 96 bytes, but a single rogue key can forge the whole aggregate.…
Newton-Raphson Root Finder Field Guide: When One Tangent Outruns Bracketing, Bisection, and Secant in a Single Iteration
Newton-Raphson doubles the digits you trust each step. Most root-finders trade one correct bit for…
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US Sailplane IGC Flight Recorder Validator Field Guide: When One Flight File Walks the Silver / Gold / Diamond Claim
A field guide to the US Sailplane IGC / XCscore / FAI Badge Flight Validator — how a badge secretary walks a flight recorder file record by record and decides whether the claim is Silver, Gold, or Diamond.