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.

Codename PURPLE: The Cipher America Broke — and Why It Didn’t Stop Pearl Harbor

2024-06-282026-10-24

전시된 97식 구문인자기(PURPLE) 실물. 미국은 실물을 본 적 없이 원리만으로 이 기계를 재현해냈다.

The United States broke Japan’s PURPLE diplomatic cipher without ever seeing the machine and read Tokyo’s final note before the Japanese embassy did, yet Pearl… Read More »Codename PURPLE: The Cipher America Broke — and Why It Didn’t Stop Pearl Harbor

The Zimmermann Telegram: How One Coded Cable Drew America into World War I

2024-06-192026-10-24

How a single coded telegram helped draw the United States into World War I: Room 40’s codebreaking, a double concealment, Zimmermann’s own confession, and the… Read More »The Zimmermann Telegram: How One Coded Cable Drew America into World War I

The Code War: The People Who Broke Enigma — From Poland to Bletchley Park

2024-05-292026-10-19

A Polish mathematician reconstructed Enigma’s wiring without ever touching the machine; a decade later, Bletchley Park’s Bombes read U-boat positions across the Atlantic. This is… Read More »The Code War: The People Who Broke Enigma — From Poland to Bletchley Park

Why Did Mother’s Day’s Founder Try to Abolish It? Origins and Korea’s Parents’ Day

2024-05-142026-10-10

Anna Jarvis, who created Mother’s Day, spent her last years trying to abolish it and fought an American campaign for a joint ‘Parents’ Day.’ From… Read More »Why Did Mother’s Day’s Founder Try to Abolish It? Origins and Korea’s Parents’ Day

Freedom of Expression: The History of a Concept and Its Limits

2024-05-112026-10-09

Freedom of expression has never been an absolute right. From the Athenian right to speak and Milton’s attack on licensing, through Swedish and American law… Read More »Freedom of Expression: The History of a Concept and Its Limits

The Dust Bowl: Drought Was Nothing New on the Plains, So Why Did the 1930s Turn to Dust?

2024-05-102026-10-09

On Black Sunday in 1935, a wall of dust turned midday into night on the American Great Plains. Drought was nothing new there, so why… Read More »The Dust Bowl: Drought Was Nothing New on the Plains, So Why Did the 1930s Turn to Dust?