LEARN TO THINK CLEARLY TO THRIVE IN THE AGE OF AI
Download Third Brain's "Growing The Pie: The Positive-Sum Mental Models Playbook"
Third Brain teaches humans how to think clearly with positive-sum mental models,
to sustainably make better decisions and live a happier life in a rapidly changing world
DID YOU KNOW?
WE ARE ALL BORN WITH THREE BRAINS
SURVIVAL INSTINCTS
THE FIRST BRAIN
Rooted in our brain stem and cerebellum, the Reptilian Complex is our “first” brain, primarily focused on the base layer of Maslow’s Hierarchy of Needs––survival.
EMOTIONS & FEELINGS
THE SECOND BRAIN
Our second brain is the Mammalian Brain, anatomically our Limbic System, which primarily deals with our emotions. This is represented by the middle two tiers of Maslow’s Hierarchy of Needs––security (our mental health, or, our relationship with ourselves) and belonging (our social health, or, our relationship with others)
LOGIC & REASON
THE THIRD BRAIN
Our third brain is the Human Brain, our Neocortex (especially the Prefrontal Cortex), which is primarily responsible for reasoning, logic and temporal planning. It is where critical, clear thinking resides, and it is what sets us humans apart from any other animal ever.
THINK CLEARLY AND POSITIVE-SUM
IT'S TIME TO TRAIN YOUR THIRD BRAIN
Download Third Brain's "Growing The Pie: The Positive-Sum Mental Models Playbook"
THIRD BRAIN'S GUIDING PRINCIPLE
Chapter 0: Growing The Pie
WHAT DOES IT MEAN TO LIVE A GOOD LIFE?
We start with meta-thinking, the most important skill of all to learn. Learning HOW to think is the most important, compounding life skill as it upgrades your default decision-making operating system.


Chapter 1: Clear Thinking
Thinking clearly and positive-sum is about realizing the world is not so black-and-white, it is not so binary. Rather, the truth resides in the messy gray, the nuance.
Chapter 2: Personal Growth
FAIL FORWARDS FAST TOWARDS YOUR BEST SELF, REPEATEDLY
Chapter 3: Objective Truth
Thinking clearly and positive-sum means realizing the world is not so black-and-white. Rather, the truth resides in the messy gray––and to find it requires consistently engaging in open dialogue with radical candor
Download Third Brain's "Growing The Pie: The Positive-Sum Mental Models Playbook" for free
Third Brain's Core Values
LEARN HOW TO THINK CLEARLY TO THRIVE IN THE AGE OF AI
Third Brain guides you to think positive-sum so you can live a happier, more fulfilling life in the post-AI world—the "Era of the Soul"—together
Download our free Positive-Sum Mental Models playbook