Yook JiHun

Editor, Popular Science Korea

More from Yook JiHun

SEOUL, SOUTH KOREA - MARCH 21: Fans of K-pop boy band BTS cheer during the comeback concert of K-pop boy band BTS near the Gwanghwamun Square on March 21, 2026 in Seoul, South Korea. The free concert is the band's first performance in nearly four years.

How BTS turned an entire city into a stage

A group of Emperor penguin chicks (

A huge iceberg becomes a deadly trap for penguins

a robot floating

International Space Station

Lost in space: How ’digital twins’ saved NASA’s robots

The STS-92 crew exits the Operations and Checkout Building on their way to the Astrovan and Launch Pad 39A for a simulated countdown. Walking left to right are (foreground) Mission Specialists Koichi Wakata of Japan, Peter J.K. “Jeff” Wisoff and Leroy Chiao; and Pilot Pamela Ann Melroy. Behind them are Mission Specialists Michael E. Lopez-Alegria and William S. McArthur Jr.; and Commander Brian Duffy. The crew is taking part in Terminal Countdown Demonstration Test activities that provide emergency egress training, opportunities to inspect the mission payload, and the simulated countdown. STS-92 is scheduled to launch Oct. 5 at 9:38 p.m. EDT on the fifth flight to the International Space Station. It will carry two elements of the Space Station, the Integrated Truss Structure Z1 and the third Pressurized Mating Adapter. The mission is also the 100th flight in the Shuttle program

A NASA commander’s most important system wasn’t a computer. It was the crew.

3D printing tackles titanium to create rocket parts

Grosse Steckmuschel, Pinna nobilis, Les Ferranelles, Medes Inseln, Costa Brava, Mittelmeer, Spanien | Noble Pen Shell, Pinna nobilis, Les Ferranelles, Medes Islands, Costa Brava, Mediterranean Sea, Spain

From waste to wonder: Revival of ancient Roman ‘golden fiber’ with pen shells

a mine opening with tracks running in

How an abandoned mine became Korea’s moon lab