Kurt Greiner
The Whole-Stack Trap: Why We Start With Fewer Protocols
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Every protocol you add to your life has a compliance tax. The tax has four components: mental overhead (remembering to do it), scheduling friction (finding t… Read more…
Cyclic Sighing: What One 28-Day Trial Shows (and Doesn’t)
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Five minutes a day of cyclic sighing lifted self-reported mood more than mindfulness meditation in one small, exploratory trial. Here is what the study measured, what it did not find, and how the practice works. Read more…
The Analog First Hour
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You have heard the advice before: do not check your phone in the first hour of waking. Keep the morning analogue. No email, no news, no Slack. Read more…
Does Information Overload Cause Decision Fatigue? What Replication Tells Us
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The standard explanation for information fatigue is cognitive overload. The idea is that your brain has a limited processing capacity and that excessive info… Read more…
What ‘Vitality Span’ Gets Wrong About Aging
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“Vitality span” sounds meaningful but works as a marketing label: a Europe PMC search in October 2026 found no research papers that use the term. The idea behind it is real, and VO2 max is the best-studied measurable proxy we found. Read more…
The Gut-Brain Axis: What’s Real vs. Overstated
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What research says about gut bacteria, probiotics, and food variety for mood and thinking, and where the marketing runs ahead of the evidence. Read more…
