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Deep dives, worked examples, and long-tail guides that go further than any single tool's built-in explanation. Each post pairs with one of our free calculators. Nothing uploaded, nothing tracked.

19 posts2 data reports9 topics

LatestFinance & TaxHow Much of a Tariff Actually Reaches the Shelf PriceFour research teams measured the 2025 US tariffs. About 24 to 26 percent of the tariff rate reached retail prices, and they disagree on whether consumers paid 43 percent of the dollars or all of them. Here's which number to use.September 30, 2026 · 9 min readPairs with Tariff Cost Passthrough Calculator

Data reports

Each report pulls together 20 or more sources we fetched and read. It shows how the data was compiled, the key figures with exact numbers, every source, and a ready-made citation, so you can quote it and link straight to the line you used.

Fitness & TrainingDATA REPORTHow Accurate Are 1RM Formulas? What the Validation Studies Actually MeasuredBrzycki's 1993 article states his formula is only valid below 10 reps-to-fatigue. An aggregate of 20 cited sources on what 1RM prediction studies actually measured, exercise by exercise, and where they disagree.September 15, 2026 · 27 min readPairs with 1RM & Strength Standards
Home & UtilitiesDATA REPORTWhat Heat Pumps Actually Achieve: Measured Efficiency vs the Rating on the BoxField studies measured annual heat pump efficiencies from 2.36 to 3.86 for the same technology. Most of that spread is measurement boundary and installation, not equipment. Here is what each study actually measured.September 2, 2026 · 17 min readPairs with Heat Pump Payback Calculator

All posts

Developer ToolsWill a Read Error Kill Your RAID 5 Rebuild?The 1-in-10^14 read error number behind "RAID 5 is dead" is a worst-case bound, and Seagate's newest BarraCuda datasheet prints it in a different unit than the old one. What the spec says, what field data shows, and what a rebuild really does when it hits a bad sector.September 27, 2026 · 9 min readPairs with RAID Storage Calculator
Finance & TaxYour BNPL Loans Are on Your Credit Report. Almost No Lender Can See Them.Affirm started furnishing every payment plan to Experian and TransUnion in 2025, but the tradelines sit outside FICO and VantageScore. What is on your file, who can actually see it, and why it is still not a reason to pick a plan.September 24, 2026 · 8 min readPairs with BNPL Total Cost Calculator
Outdoors & GardenYour Soil pH Does Not Tell You How Much Lime to AddA pH reading measures only the acidity floating in the soil water. Buffer pH measures the stored acidity that actually sets your lime rate, and two soils reading pH 5.4 can need double the lime as each other.September 23, 2026 · 9 min readPairs with Soil pH Lime & Sulfur Calculator
Outdoors & GardenIs It Legal to Sell Firewood by the Rick or Face Cord?The national method-of-sale rule bans the words rick, face cord, rack, pile and truckload in firewood sales. What your delivery ticket must list, why you should not burn the load yet, and how to measure it yourself.September 20, 2026 · 9 min readPairs with Firewood Cord & Rick Calculator
ElectronicsWhat Remote ID Actually Broadcasts About YouA Standard Remote ID drone broadcasts your live position as the pilot. A broadcast module broadcasts only the take-off spot. Here is what each message element is, who can receive it, and why a stranger still cannot turn it into your name.September 17, 2026 · 9 min readPairs with Drone Remote ID Compliance Checker
Food & BrewingCan You Pressure Can in an Electric Multicooker?Utah State researchers put temperature loggers inside the jars in three electric multicookers at three elevations. Food was often under-processed, and identical trials did not repeat. Here is what the pressure number actually stands for.September 16, 2026 · 9 min readPairs with Pressure Canning Process Time Lookup
Fitness & TrainingDATA REPORTHow Accurate Are 1RM Formulas? What the Validation Studies Actually MeasuredBrzycki's 1993 article states his formula is only valid below 10 reps-to-fatigue. An aggregate of 20 cited sources on what 1RM prediction studies actually measured, exercise by exercise, and where they disagree.September 15, 2026 · 27 min readPairs with 1RM & Strength Standards
Outdoors & GardenYour Hardiness Zone Is Not Your Last Frost DateUSDA hardiness zones measure the coldest night of an average winter, not when spring frost ends. Where last frost dates actually come from, why the average one is a coin flip, and which date to build your sowing schedule on.September 13, 2026 · 7 min readPairs with Seed Starting Date Calculator
ElectronicsIPC-2221 vs IPC-2152: Where Your Trace Width Number Actually Comes FromThe IPC-2221 trace width charts come from a 1956 Navy-funded test whose results were labelled Tentative, and its internal-trace chart was never measured at all. What IPC-2152 found in 2009, and when the old number is still the right one.September 10, 2026 · 11 min readPairs with PCB Trace Width Calculator
Developer ToolsNIST's 2025 Password Rules: No Complexity, No Expiry, and a 15-Character CatchNIST SP 800-63B-4 bans composition rules and periodic password changes outright, and its 15-character minimum only applies to single-factor passwords. What the actual text says, quoted, and what to set instead.September 9, 2026 · 8 min readPairs with Password Entropy Calculator
Outdoors & GardenFluoro Ski Wax: Where It Is Now Illegal to Sell, and What You Lose Without ItSki wax with intentionally added PFAS became illegal to sell in Minnesota in January 2025 and in Colorado and Maine in January 2026. Here is what the bans actually cover, and what ski tunnel glide tests say fluorine was worth.September 7, 2026 · 10 min readPairs with Ski Wax Temperature Calculator
Outdoors & GardenFree Chlorine 3 ppm, Pool Still Green: What Cyanuric Acid Does to That NumberA pool can hold 3 ppm of free chlorine and still disinfect slowly, because cyanuric acid binds most of it. Here is the CYA to chlorine ratio that decides whether your reading means anything.September 4, 2026 · 10 min readPairs with Pool Chemical Dosage Calculator
Science & AstronomyWhy Your AQI Reads Higher Now Than It Did in 2023EPA moved the Good/Moderate line from 12.0 to 9.0 micrograms in May 2024, so identical air now reports a higher AQI. Here's the conversion math and what the new number means.September 2, 2026 · 8 min readPairs with AQI Health Advice Calculator
Home & UtilitiesDATA REPORTWhat Heat Pumps Actually Achieve: Measured Efficiency vs the Rating on the BoxField studies measured annual heat pump efficiencies from 2.36 to 3.86 for the same technology. Most of that spread is measurement boundary and installation, not equipment. Here is what each study actually measured.September 2, 2026 · 17 min readPairs with Heat Pump Payback Calculator
Outdoors & GardenCalifornia's Zone 0 Rule: What the First Five Feet Actually RequiresCalifornia's Zone 0 defensible space rule was approved August 19, 2026. It does not mean gravelling all five feet. Here is what it requires, and by when.August 31, 2026 · 8 min readPairs with Wildfire Defensible Space Scorer
AutomotiveYour EV Didn't Lose a Third of Its Battery Last WinterAt 20°F the average EV shows about 70% of its usual range, and all of it comes back in spring. Here's what actually ages the pack, and how to tell a cold snap apart from a real fault.August 29, 2026 · 6 min readPairs with EV Battery Degradation Estimator
Home & UtilitiesYour Bedroom's CO2 Level Overnight Is Probably Higher Than You ThinkTwo people in a closed bedroom can push CO2 past 3,000 ppm by morning, well above the 800 ppm a 2025 ASHRAE-funded study links to disturbed sleep. Here's the math, and what actually fixes it.August 28, 2026 · 4 min readPairs with Indoor CO2 Ventilation Calculator
Science & AstronomyThe Night Sky Is Brightening Faster Than Satellites ShowNight skies are brightening about 9.6% a year, nearly 5x what satellites show, a citizen-science study found. Here's why, and how to check your own sky tonight.August 26, 2026 · 4 min readPairs with Light Pollution & Stargazing Calculator