The Second Brain
David TostYour gut controls your mood. AI is reshaping therapy. Longevity science is going mainstream. This is where mental health, technology and performance collide.
| Platform |  | Pricing | Freemium | Publishes | Daily |
|---|---|---|---|---|---|
| Issues | 65 | Founded | 8 months ago | Last Issue | 7 days ago |
| Active | |||||
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secondbrainnotes.substack.comLatest Issues
How To Use AI As A Thinking Partner (Without Letting It Think For You)
The exact system, prompts, and weekly workflow to make AI sharpen your mind instead of slowly rotting it. This is the setup I use every single day.
Here’s the thing nobody wants to say out loud.
Why You Can't Focus (And The System That Fixes It)
The complete focus system. Not tips. A machine. This is how you build the rarest skill left — the ability to do one thing, deeply, while everyone else drowns in noise.
Let me start with uncomfortable truth.
The 90% Of Your Work That Doesn't Matter
Here’s a myth that’s killing you: Busy people win.
They don’t.
Busy people lose. Slowly.
They lose years.
They lose attention.
They lose the ability to tell the difference between motion and progress.
They get really good at rearr...
The Habits That Add Decades (That Cost Nothing)
A Harvard team tracked more than 100,000 people for over three decades.
The ones who did five simple things lived, on average, twelve to fourteen years longer than the ones who didn't.
Not one of the five cost a single dollar.
Let me s...
How To Become Untraceable
By the end of this decade, your job description will probably be done by software.
The question nobody's asking honestly is what happens to you when it is.
Most of what passes for “AI career advice” right now is wishful thinking dressed...
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Authors
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I write about ambition, mental resilience, and the modern mind. Author, The Second Brain. Building Sona.
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