Seeing the dirt floor of Varanasi covered in trash, I hesitated to go out. Yet, driven by intense curiosity, I eventually headed toward the Ganges River. My experience there made me realize the river is a mysterious place where life and death coexist.   Seeing the dirt ground covered in trash, I resolved never to go out. When I opened the window to breathe in the outside air, the stench...

When a typhoon approaches, many people prepare by taping or covering their windows with newspaper. But is this truly an effective method? We analyze its effectiveness through scientific principles and experiments, and explore more reliable typhoon preparedness methods.   In September 2024, the massive Hurricane Hurlinn struck the southeastern United States, reaching maximum sustained winds...

How can we prevent free-riding in group assignments and ensure everyone participates fairly? We explore effective methods for managing group assignments.   In high school, when group assignments are given, it’s common for the top student to handle all the work alone, while the other members briefly glance over it before the presentation. From the perspective of the top student—the one...

Sound pressure is a physical quantity, while loudness refers to the perceived loudness by humans. The interaction between frequency and sound pressure relates to auditory characteristics, and understanding this aids in creating better acoustic environments.   From a physical perspective, sound possesses both sound pressure and frequency. Sound pressure, in particular, represents sound as...

Civil engineering has evolved alongside human history. Various specialized fields—such as structural engineering, geotechnical engineering, and geospatial engineering—are harmoniously applied to create outstanding civil structures. This significantly impacts social efficiency and environmental sustainability.   Civil engineering has advanced hand in hand with human history. From small...

This blog post explores the difference in regenerative abilities between lizards and dogs from a scientific and evolutionary perspective in an easy and interesting way.   When threatened by a predator, a lizard will voluntarily sever its own tail and flee, leaving the severed tail behind as bait. So, does a lizard live without a tail forever after losing it? No. A lizard’s tail grows...

This blog post explains why cigarette smoke rises straight up before swirling and dispersing from a fluid dynamics perspective in an easy and interesting way.   Fluid Dynamics Seen Through Cigarette Smoke Everyone probably has memories from childhood of staring blankly at the smoke from their father’s cigarette or the incense smoke rising from the ancestral altar. At first, it clings...

This blog post examines why electric vehicles are rejected even by environmentally conscious modern consumers, critically exploring the underlying selfish consumer psychology at play.   Recently, persistent hazy weather due to fine dust has heightened public awareness about environmental protection. Previously, a television program also raised awareness about environmental pollution by...

This blog post examines technical and managerial measures to ensure the safety of nuclear power plants, based on the Fukushima and Chernobyl accident cases.   The Fukushima nuclear accident has reignited heated debate about the safety of nuclear power plants. In South Korea, recent revelations of corruption among nuclear industry workers have eroded trust in nuclear power. Coupled with media...

In this blog post, we examine from a philosophical perspective whether the necessary relationship between cause and effect can be applied identically at the group level.   People believe that every result always has a corresponding cause. The necessity of cause and effect can be generalized through individual cases. For example, if Person A became ill due to stress and Person B also became...