ZhiZhi Gewu

Every Crisis Is Someone's Liability Due: Reading the Joint Currency Intervention of Yen

On July 31st, 2026, the United States and Japan executed a joint currency intervention, buying Japanese yen to pull the currency back from a 40-year…

Aug 16 • KY John

Success Is Mostly Luck — So I'm Betting on AI

What building automated AI agents taught me about luck, control, and the limits of parallelization

Aug 10 • KY John

Frontend Is Basically a Solved Problem for AI

If you have a clear idea of what good design looks like, AI can now build it for you. The taste is still yours; the implementation is basically free.

Aug 1 • KY John

July 2026

Building AI Tools to Solve My Own Problems

How a $100/month subscription became my personal software factory

Jul 19 • KY John

Can a Foundation Model Match XGBoost on Tabular Data?

Deep learning no longer loses tabular by default.

Jul 6 • KY John

June 2026

The Last Mile From Analysis (Answers) to a Data Mart (Assets)

An analyst’s notebook is not a pipeline — and the gap is wider than it looks

Jun 21 • KY John

I Let a Neural Network Do My Feature Engineering — Then Made It Explain Itself

An experiment in automated feature discovery for credit risk: a sequential model trained on raw payment history, interrogated with explainability tools…

Jun 13 • KY John

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May 2026

I knew the rules of Go. Writing them for a machine taught me I didn't understand them.

I’m rebuilding AlphaGo from scratch — 9×9 board, no shortcuts — to actually understand how it works instead of just running someone else’s repo.

May 30 • KY John

Why Singapore has no policy rate, the yen collapsed, and Brazil paid you 14% to hold a rising currency?

How Every Country Actually Runs Its Money

May 24 • KY John

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What's Really Going On in Machine Learning? A Simplest Example by Stephen Wolfram

From Neural Networks to Rule Arrays: A Minimal Model of Learning

May 16 • KY John

Interchange Fee and the Universal Acceptance of Cards

Payment is fundamentally a two-sided market. Cardholders want more merchants accepting their cards. Merchants want more cardholders. Increasing the…

May 9 • KY John

April 2026

What 50 years of Singapore property prices tell us about risk

Why "average return" lies, why one quarter in 1993 still distorts a 35-year statistic, and what this means for anyone planning to buy property

Apr 25 • KY John