Johnson 
Our team spent 6 weeks testing 8 of the best wedge pillows for acid reflux relief currently on the market, sleeping on each one for at least 4 nights. We measured how steeply each pillow elevated our torsos, how well each one kept us from sliding, and how our reflux symptoms responded. A wedge pillow … Read more
Hot sleepers know the 3 AM struggle: sheets kicked off, pillow flipped, that damp spot on the shoulder that won’t quit. I’ve spent the last 90 days sleeping on eight different latex mattresses in a 78°F bedroom with no AC cranked below 72°F, and I can tell you which ones actually breathe and which ones … Read more
If you weigh over 250 pounds and your back wakes you up every morning, the mattress under you is part of the problem. Standard mattresses built for average-weight sleepers compress within two to three years, and once that happens your spine loses its neutral alignment. I have spent the last three months testing eight mattresses … Read more
I know what it feels like to wake up with a stiff lower back and dread the next night. After our team spent three months sleeping on eight different memory foam mattress toppers, I can tell you with confidence that the right topper can change how your mornings feel. Back pain is one of the … Read more
Side sleepers need a soft, pressure-relieving surface that cradles hips and shoulders while keeping the spine aligned. After 90 nights of testing 32 latex toppers in our sleep lab, I can tell you the difference between waking up refreshed and waking up with numb arms is mostly about three things: latex type, thickness, and firmness. … Read more
If you wake up at 3 a.m. with damp sheets and a pillow that’s been flipped three times, you already know the frustration. Our team spent the last four months testing 10 of the most popular graphite and graphite-style mattress toppers across three homes, two climate zones, and a particularly stubborn hot sleeper who insists … Read more
The Kolmogorov-Smirnov test is one of the most widely used statistical tools for checking normality, yet research consistently shows it is often the wrong choice. Multiple peer-reviewed studies, including a highly cited 2012 paper by Ghasemi et al. published in the Journal of Applied Statistics, conclude that the KS test should no longer be used … Read more
If you have ever stared at a blank document trying to write a learning objective that actually means something, you are not alone. Most educators and instructional designers I have worked with struggle with the same issue: their objectives sound good on paper but fail when it comes time to measure them. That is exactly … Read more
Assessment alignment connects what you teach with how you measure student learning. When your tests, assignments, and tasks directly reflect your learning objectives, you get accurate data about what students actually know and can do. Many educators design lessons and then create assessments separately, which often leads to gaps between intended and measured learning. In … Read more
If you have ever stared at a scatterplot and wondered whether to run Pearson or Spearman correlation on your data, you are in the right place. The difference between Pearson and Spearman correlation comes down to one core question: is the relationship between your variables linear, or just consistently directional? Picking the wrong method can … Read more