Body & BiologySOURCES & LIMITS VISIBLE
Does a High Correlation Mean Two Measurements Agree?
Two methods can move together perfectly while giving different answers. Here is the question a correlation score cannot settle.
4 min readRead
HUMANOS RESEARCH NOTES · SOURCE COMPARISON · VISIBLE LIMITS
Questions worth opening.
Sources worth seeing.
High-interest questions, checked against original studies, historical records, competing interpretations, and practical limits. Institutional sources are evidence inputs—not automatic verdicts—and criticism is judged by the same source standard.
Body & BiologySOURCES & LIMITS VISIBLE
Why Your HRV Numbers Can Differ Between Devices
Two HRV values can share a unit and still describe different measurements. Read the label before the trend.
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Body & BiologySOURCES & LIMITS VISIBLE
Can One Long Night Repay Sleep Debt?
A longer night answers how much sleep was possible. Recovery needs an outcome and a baseline.
4 min readRead
Body & BiologySOURCES & LIMITS VISIBLE
Is Regular Sleep More Important Than Sleep Duration?
Two weeks can have the same average sleep hours and very different timing.
4 min readRead
Body & BiologySOURCES & LIMITS VISIBLE
What Your Sleep Score Can—and Cannot—Tell You
Your watch may label sleep well and still miss the time you were awake.
5 min readRead
Body & BiologySOURCES & LIMITS VISIBLE
Morning Light vs. Window Light: What Actually Reaches Your Circadian Clock?
Outdoor light can be far brighter than indoor light. That supports a useful morning habit, but it does not prove a ten-minute ritual ‘resets dopamine.’
7 min readRead
Mind & AutonomicsSOURCES & LIMITS VISIBLE
The Physiological Sigh: What Five Minutes a Day Changed—and What It Did Not
A randomized remote study found that brief daily breathwork improved mood and reduced respiratory rate over a month. It did not prove that two breaths erase anxiety or inflammation in 180 seconds.
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Inner Life & AcousticSOURCES & LIMITS VISIBLE
40 Hz and Alzheimer’s Headlines: The Mouse Findings, Early Human Signals, and Missing Proof
Mouse experiments changed neural activity and disease-related pathology. That does not establish an Alzheimer’s treatment in people—or prove ancient sound traditions used the same mechanism.
8 min readRead
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