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September 2025

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2025年9月26日 / Last updated : 2025年9月26日 桑子 研 Science

NASA’s Experiment: A Feather and a Steel Ball Fall Together! Why Do They Drop at the Same Time? Galileo’s Astonishing Law of Falling!

I’m Ken Kuwako, the Science Trainer. Every day is an experiment. 【This article is also available on the radio!】 The story goes that Isaac Newton discovered the law of universal gravitation after seeing an apple fall from a tree. We’ve all dropped something, like our smartphones slipping from our hands. These ordinary moments of things […]

2025年9月26日 / Last updated : 2025年9月26日 桑子 研 Science

Science You Can Use Tomorrow! The Physics of Sharing a Bucket and Tips for Hanging Longer on the Bar

I’m Ken Kuwako, your Science Trainer. Every Day is an Experiment! How to stand to win a tug-of-war, the secret to easily carrying a heavy load with a friend, the physics behind a hero soaring through the sky… The answers to all these questions are actually hidden in a core concept of physics: “Decomposition of […]

2025年9月25日 / Last updated : 2025年9月25日 桑子 研 Science

Is Your Intuition Wrong? A Deep Dive into Newton’s Third Law (with Mind-Twisting Examples!)

I’m Ken Kuwako, a science trainer. Every day is an experiment.   The Law of Action and Reaction: A Sumo Showdown Between an Elephant and a Gorilla! Today, I want to pose a little “force” quiz. Imagine this: a massive elephant and a powerful gorilla face off in a sumo match. They collide with a […]

2025年9月24日 / Last updated : 2025年9月24日 桑子 研 Science

[No More Confusion!] The Ultimate Chemistry Recipe to Convert Mass Percent, Molarity, Normality (N), and ppm with Ease

This is Ken Kuwako, the Science Trainer. Every day is an experiment. Have you ever been following a recipe and wondered what “a pinch of salt” really means? In the world of chemistry, we have a similar situation with several ways to express “concentration,” and scientists choose the best one for the job. Today, let’s […]

2025年9月23日 / Last updated : 2025年9月23日 桑子 研 Science

Web App Oscilloscope ‘XXY OSCILLOSCOPE’ — A Game-Changer for Teaching Sound!

I’m Ken Kuwako, a science trainer. Every day is an experiment. Did you know that your voice has a unique “shape,” just like a fingerprint? Wouldn’t it be cool to see the invisible sounds of your laughter, a serious conversation, or your favorite song lyrics in real-time, just like a scene from a movie? If […]

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

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