Cyclic Sighing vs Box Breathing: What the Research Actually Shows
A Stanford trial put four practices head to head at five minutes a day. One beat meditation on mood — and was the only one to slow resting breathing all day.
We build software on top of real research. These are the deep dives: the physiology behind CalmTide and SolGlow, and the trading ideas you can practise in Hedge Fund CEO.
A Stanford trial put four practices head to head at five minutes a day. One beat meditation on mood — and was the only one to slow resting breathing all day.
Four days a year in Cyprus. 215 in Reykjavik. Why the sun's angle — not the cold — shuts synthesis off, and why the fix starts in September.
Caffeine, alcohol, late meals, hard workouts — what each measurably does to your stress physiology, and why you can only read the verdict the next morning.
It was built to predict sunburn. Vitamin D follows a different action spectrum — and the gap between them moves with sun angle and ozone.
No smartwatch has a cortisol sensor — not Apple Watch, Oura, or WHOOP. But your wrist tracks proxies that shadow stress. Here's what it can and can't tell you.
The symptoms are vague and the guidance just shifted. Here's what deficiency is, who's most at risk, and how to gauge your own — without guessing.
Calls, puts, premium, time decay, and the Greeks in plain English — why options are risky, and how to build the intuition risk-free.
"15 minutes a day" is close to useless — the real answer changes 10× with your skin type, latitude, season, and time of day. Here's what actually determines it.
HRV, deep sleep, training zones and the HPA axis — why the metrics on your wrist track chronic stress, and how CalmTide turns them into one number.
Why a supplement number on a bottle tells you less than the sun does — and the physiology SolGlow uses to estimate what your skin actually made today.
From dollar-cost averaging to covered calls — classic strategies explained, and how to rehearse each one with virtual money before risking real capital.