EvvyTools Blog
Smart guides, how-tos, and tool deep dives. Better decisions start with better understanding.
Health & Wellness
How to Pace a First Marathon Without Blowing Up in the Second Half
Your marathon goal time is a math problem in miles 1 through 3 and a discipline problem in miles 20 through 26. Here is how to get both right.
Financial Literacy
How to Stress-Test Your FIRE Plan Against a Bad Decade Before You Actually Quit the Job
A single average return number is not a plan. Here is how to see whether your FIRE math actually survives a decade that looks nothing like the average.
Tool Deep Dives
Why Your Cron Job Did Not Fire and How to Read the Schedule You Wrote
A practical walkthrough of why cron jobs miss runs, how to read a five-field expression without guessing, and how to confirm the schedule before deploying.
How-To Guides
How to Use Ohm's Law in Practice Without Making Unit Conversion Mistakes
Most Ohm's Law mistakes happen at the unit prefix, not in the algebra. Here is how to keep mA, kohms, and mW straight in real circuits.
Tool Deep Dives
Why Grammar Checkers Flag Passive Voice Even When It Is the Right Choice
Grammar checkers flag passive voice on principle, not on context. The rewrite is sometimes wrong. Here is how to tell the keepers from the fixes.
Health & Wellness
Why Some Supplements Cancel Each Other Out
Some supplement pairs compete for the same absorption pathways. Learn which combinations quietly waste your stack and how to time them apart.
How-To Guides
How to Sequence Appliance Startups on a Portable Generator During an Outage
Most portable generators die not from total load, but from two surges colliding. Here is how to plan startup order so the breaker holds.
Tool Deep Dives
How to Verify a Downloaded File's Checksum So You Know the Release Wasn't Tampered With
A practical walkthrough for checking a downloaded file's hash against the project's published value before you trust the binary on your machine.
How-To Guides
How to Project Your Net Worth 10 Years Out Without Lying to Yourself About Returns
How to build a 10-year net worth projection that survives contact with reality, instead of one that quietly assumes a perfect decade of stock returns.
Financial Literacy
Why Home Insurance Uses Replacement Cost (Not Market Value) and How to Estimate It Yourself
Why home insurance dwelling coverage uses rebuild cost instead of market value, and a practical way to estimate yours before your next renewal.
Financial Literacy
Lumber Grades Explained: How to Read Grade Stamps and Price Tiers
How to read lumber grade stamps, what each tier really means, and how grade choice changes your project budget per board foot.
Financial Literacy
Why AdSense RPM Varies So Much by Niche and Traffic Source
Two publishers with the same pageviews can earn checks that differ by 20x. Learn what page RPM actually measures and why niche and traffic source explain most of the gap.