biometrics

retention

How Long-Term Retention Signals in Wellness Protocols Mirror Biomedical Material Retention and Predict Revenue Growth

A 90‑day self‑experiment shows how daily check‑ins create retention signals that parallel biomedical material persistence, offering early clues about long‑term engagement.

hrv

HRV Variability Beats Average: How Night‑to‑Night Dispersion Predicts Stress Resilience

A 2026 Stanford sleep lab analysis found that night‑to‑night HRV variability outperforms average HRV for predicting daily stress. Here’s the science and a simple experiment you can run.