Southman

I am In Nam, the editor of glu.kr. Under the mission “God Loves U: learn, discuss, and explain all things that God created,” I write across six areas — culture, history, science, plants, animals, and climate. Every article begins as an AI-assisted draft, then goes through source checks, numerical verification, and terminology review before I read and edit it myself for publication. Images carry their source and license, with freely licensed material preferred. If you find an error, write to south-man@daum.net. I verify it, correct the article, and note the change.

Why a cabbage spreads its outer leaves and wraps its inner ones

2026-08-242026-08-24

A whole napa cabbage on a tray, outer leaves opening away from the tightly folded core

Pick up a head of napa cabbage and the outer leaves have opened away while the inner ones wrap each other. The reason is that… Read More »Why a cabbage spreads its outer leaves and wraps its inner ones

Cool It Slowly and It Cracks: Bangjja Yugi’s Quench Runs Opposite to Steel

2026-08-212026-08-22

Rows of bangjja yugi bronze bowls of various sizes on a table, one of them filled with bibimbap

Copper 78 percent, tin 22 percent — more than twice what modern engineering recommends — heated until it glows and beaten with a hammer. Steel… Read More »Cool It Slowly and It Cracks: Bangjja Yugi’s Quench Runs Opposite to Steel

The Ground Is Sweltering, but Ice Grows in the Sky — The Design Principle of Hail

2026-08-152026-08-15

The ground is baking in early-summer heat, yet just 5-10 km overhead the sky sits at -10 to -30°C. This piece looks at how hail… Read More »The Ground Is Sweltering, but Ice Grows in the Sky — The Design Principle of Hail

Schrödinger’s Cat: Is It Really Half Alive and Half Dead?

2026-08-132026-09-21

Schrödinger’s 1935 thought experiment was never meant to illustrate the strangeness of quantum mechanics — it was a rebuttal aimed squarely at the Copenhagen interpretation.… Read More »Schrödinger’s Cat: Is It Really Half Alive and Half Dead?

Light Piles Up, But Why Can’t Electrons? — The Design Behind Bosons and Fermions

2026-08-132026-09-21

Billions of laser photons can occupy the exact same state without any trouble, yet two electrons can never share one. A single property called spin… Read More »Light Piles Up, But Why Can’t Electrons? — The Design Behind Bosons and Fermions

The Atom That Couldn’t Be Cut, and the Structure Found Inside It

2026-08-122026-09-21

For over two thousand years after its name promised something indivisible, whether atoms were even real stayed a live dispute in physics — and once… Read More »The Atom That Couldn’t Be Cut, and the Structure Found Inside It