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September 2025

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2025年9月5日 / Last updated : 2025年9月5日 桑子 研 Science

Preparing a rose of Sharon stem with a slide kit is easy and the results are amazing! Don’t just ‘look’ at plants; here are some tips for effective observation.

I’m Ken Kuwako, the science trainer. Every day is an experiment. The internal structure of plants, especially their stems and roots, is often invisible to the naked eye. Because of this, it’s hard for students to even wonder, “Why is it built this way?” But this “stem cross-section observation” goes beyond just memorizing textbook knowledge. […]

2025年9月4日 / Last updated : 2025年9月4日 桑子 研 Science

Measuring Reaction Time with a Ruler: The Ruler Drop Experiment

I’m Ken Kuwako, the science trainer. Every day is an experiment. Measure Reaction Time with Everyday Items! A Simple Experiment for the Classroom and Home When discussing topics like “the speed of chemical reactions” or “nerve impulse transmission” in class, students often ask simple questions like, “How do you actually measure that speed?” or “Is […]

2025年9月4日 / Last updated : 2025年9月4日 桑子 研 Science

Terror of a 16m Drop, Explained by Science! A Mathematical Look at Splash Mountain: Disneyland Physics

I’m Ken Kuwako, your Science Trainer. Every day is an experiment. Did you know you can calculate the speed of Splash Mountain using physics? This article is also available on our radio show! If I were to ask, “Who has ridden Splash Mountain at Tokyo Disneyland?”, almost everyone in the classroom would raise their hand. […]

2025年9月3日 / Last updated : 2025年9月3日 桑子 研 Science

Don’t know where θ goes? Clear it up with a drawing trick! (A story connecting nursing and high school physics on “Force Decomposition”)

I’m Ken Kuwako, a science trainer. Every day is an experiment. Even Nursing Students Struggle?! Let’s Make Physics Fun with Remedial Education! Have you ever heard of remedial education? Simply put, it’s about “supplementing the foundational academic skills needed for university studies.” A lot of students in nursing programs, in particular, struggle with physics, so […]

2025年9月2日 / Last updated : 2025年9月2日 桑子 研 Science

Draw a Face on a Balloon: Making Invisible Forces Visible! A Magical Way to Master Physics’ “Force Arrows”

Have you started high school and are already scratching your head over the basic science courses? Physics, especially, can be a major headache. You’re told, “Draw the forces!” but they’re invisible, so how can you even begin? Many people feel lost. Even if your teacher tells you, “First draw the force of gravity, and then […]

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著者:桑子研(くわこ けん)
 科学の楽しさや不思議、感動を多くの人に届けていきたい。理科教師として勤務する傍ら、サイエンストレーナーとしてテレビ番組の科学監修・出演、実験教室、科学本執筆なども行っています。

Author: Ken Kuwako
I want to share the fun, wonder, and excitement of science with as many people as possible. In addition to my work as a science teacher, I also work as a "Science Trainer," providing scientific supervision for and appearing on TV programs, holding hands-on science workshops, and writing science books.

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Why Does Salt Water Conduct Electricity but Sugar Water Doesn’t? The Shocking Secret of Kitchen Chemistry!

2025年10月16日

When It Fizzes—A Peek into the Ancient Sea! Uncovering the Mystery of Rocks with Just a Drop of Acid (Limestone vs. Chert)

2025年10月15日

Journey North from the Nobel Prize Lands: The Hidden Science of Sweden’s Rural Bridges

2025年10月14日

The Magic Mirror Trick: How a Half-Eaten Cake Comes Back! A Fun Card Mirror Experiment for Students

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