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September 2025

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2025年9月21日 / Last updated : 2025年9月21日 桑子 研 Science

How to Dilute Hydrochloric Acid, Sulfuric Acid, Ammonia, and Copper Chloride: Master the Basics of Dilution for Safe Lab Prep!

I’m Ken Kuwako, a science trainer. For me, every day is an experiment. 【Read this article in English】 When handling chemicals in the science lab, a solid understanding of dilution is essential for conducting experiments “safely, accurately, and efficiently.” In this guide, I’ve put together key dilution methods, safety protocols, and practical concentration levels for […]

2025年9月20日 / Last updated : 2025年9月20日 桑子 研 Science

Science at the Dinner Table! Pop! Is Sprinkling Salt Really the Same as the “Daruma Otoshi” Trick? (Law of Inertia)

The Law of Inertia Hiding in Your Kitchen The law of inertia, which is so seamlessly integrated into our daily lives, can be found right in the kitchen. It’s that simple act of sprinkling salt! When you’re cooking, you rhythmically shake salt or pepper onto your food, right? That seemingly simple motion is actually a […]

2025年9月20日 / Last updated : 2025年9月20日 桑子 研 Science

Struggling with Those Scissors? Rethink Your Tools with the Science of Levers and Work!

I’m Ken Kuwako, a science trainer. Every day is an experiment! Hello everyone! Do you ever just grab a pair of scissors or pliers from your drawer and use them without thinking? What if knowing the hidden rules of force behind these tools could make your daily life smarter and more fun? The truth is, […]

2025年9月20日 / Last updated : 2025年9月20日 桑子 研 Science

Too Late Once You See It! Learn the Secret of the ‘0.2-Second Wall’ with the Banknote Catch Challenge (Reaction Speed)

Hi, I’m Ken Kuwako, your Science Trainer. Every day is an experiment! Imagine a 1000-yen bill fluttering right in front of you. What if you could snatch it with your fingers? If you could, it’s yours! Wouldn’t you want to try a challenge like that? 😉 At first glance, it seems like a super easy […]

2025年9月19日 / Last updated : 2025年9月19日 桑子 研 Science

Why Can’t Sweet Corn Pop? The Explosive Secrets of Volcanoes and Magma

I’m Ken Kuwako, a science trainer. Every day is an experiment. 【This article is also available as a radio broadcast!】 You can’t make popcorn from the sweet corn sold at the supermarket. The truth is, popcorn comes from a special kind of corn called “Popcorn Corn.” If you touch it, you’ll find it’s incredibly hard. […]

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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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Recent posts

Why Does a Motor Keep Spinning? Unraveling Fleming’s Law and the Secret of the Commutator with Digital 3D and Papercraft!

2025年10月19日

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2025年10月19日

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2025年10月17日

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

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