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RPE is the Intensity Scale Your Watch Can’t Read
A 1-to-10 number on every working set is the cheapest intensity measurement in training. Here's how to read it, log it, and stack it against heart rate and Training Stress Score.
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Before You Watch the Whole File, Generate the 10-Second Version
A practical guide to using Video Preview Generator for evenly sampled timeline triage before committing to a full video review.
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Mulch Calculator: The Cubic-Yard Mistake That Turns One Bag Into Three
A practical guide to estimating mulch, gravel, topsoil, sand, and compost by depth, density, weight, bulk bags, small bags, allowance, and cost.
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Break-Even Calculator: The Formula Is Simple. The Honesty Is Not.
A break-even calculator does not make the decision. It makes the assumption set visible. Here is how to use one without fooling yourself.
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Kepler Orbit Solver: Why M = E − e·sin E Has No Closed Form (And How to Solve It Anyway)
Three numerical methods for Kepler's transcendental equation: Newton-Raphson, bisection, and fixed-point iteration — compared on Earth, Mercury, and a near-parabolic comet orbit.
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ASS to SRT Converter: the Format Bridge That Fansubs and Broadcasts Both Need
The format gap between ASS and SRT is wide. This single-pass, client-side converter drops styling, preserves timing, and emits clean numbered cues — for fansubs, broadcast masters, and pipelines that need to read both.