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.
You light a fire only briefly in the evening, yet the floor stays warm until dawn. The ondol is an ingenious heat-storing system: it detours… Read More »How One Fire Keeps a Whole Room Warm All Night — The Heat Design of the Ondol
Every spring a whole city’s cherry trees burst into bloom within days and fall together about a week later. This synchrony is no accident —… Read More »Why a Whole City’s Cherry Blossoms Open in the Same Week — The Temperature Math Hidden in Bloom
In spring, whole neighborhoods turn pink — but the Japanese apricot, apricot, peach, and plum are all different trees, not cherries. They look alike because… Read More »Cherry Blossoms and Their Look-Alikes — Telling Apart Five Spring Blossoms of the Genus Prunus
A single fair-weather cumulus cloud weighs about 500 tonnes — as much as 100 elephants. So why doesn’t it fall? We look at the terminal… Read More »A Cloud Weighs as Much as 100 Elephants, Yet It Doesn’t Fall — The Physics Hidden in a Single Droplet
The Moon shows us the same face not because it ‘doesn’t rotate’ but because its rotation is perfectly synchronized with its orbit. We explore the… Read More »Why the Moon Always Shows the Same Face — The Design Behind Tidal Locking
A palm-sized pink rodent overturns our assumptions about mammals again and again – a eusocial colony ruled by a single queen, a body in which… Read More »The Naked Mole-Rat: Barely Knowing Cancer, Living 30 Years
