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.
Light has been traveling for 13.8 billion years, but the galaxy that emitted it now sits 46.5 billion light-years away. Here is why the observable… Read More »Light Took 13.8 Billion Years to Reach Us, So Why Is the Observable Universe 46.5 Billion Light-Years Away?
Do cats really always land feet-first? The secret of the falling cat, which reorients itself despite zero angular momentum, lies in having a body that… Read More »Why Do Cats Almost Always Land on Their Feet — How Do They Turn With Zero Angular Momentum?
Why does mother-of-pearl inlay shift color as you turn it? A nanometer-scale layered structure inside the shell, not any pigment, does the work
A tug-of-war of stalemate — how the Okhotsk and North Pacific air masses lock the Changma front in place over the Korean Peninsula
Starlight and planetlight both cross the same atmosphere, yet one flickers and the other stays steady — the difference lies in the turbulent air above… Read More »Why Do Stars Twinkle But Planets Don’t
The summer sound everyone hears but no one quite understands: a cicada makes its call not with vocal cords, but with a ‘drum’ on its… Read More »A Cicada Sings With Its Belly, Not Its Throat
