Short, evidence-based reads on how your body actually works. Every claim arrives with its source — and a plain statement of what the science can’t tell you.
The context a number can’t carry on its own.
A short guide to what your resting pulse says about recovery, fitness, and stress — and the things that make it lie.
Trace the 12 meridians on the body, watch the live organ clock, and see how the old model squares with circadian science.
Click countries on a world map or paste your DNA results to see what your ancestors ate day to day — 143 regions, 1,144 historical recipes.
Every explainer here is short, sourced, and written in plain English. Where the science is genuinely uncertain, the page says so instead of rounding the doubt away.