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2025年10月31日 / Last updated : 2025年10月31日 桑子 研 Science

Kitchen CSI: Unmasking the White Suspects (Salt, Sugar, and Flour!)

Every Day is an Experiment. Take a look at those pure white powders in your kitchen. Sugar, salt, flour. They look identical, but what if they got shuffled up and you couldn’t tell which was which? How would you identify them? (No tasting allowed!) This time, we’re diving into a “Science Mystery” lurking in our […]

2025年10月31日 / Last updated : 2025年10月31日 桑子 研 Science

Not Just a Leaf! The Hidden “Red Dots” on Cherry Leaves and Their Secret Life with Ants

This is Ken Kuwako, your Science Trainer. Every Day is an Experiment. 【This article is also available on the radio!】 When we talk about cherry blossom viewing, the beautiful petals are, of course, the main attraction. But have you ever taken a close look at the leaves—the very things that support the star of the […]

2025年10月31日 / Last updated : 2025年10月31日 桑子 研 Science

The Secret History of the Static ZAP: From 30,000 Volts on Your Doorknob to the Edo Period’s “Hundred People Shock.”

I’m Ken Kuwako, your Science Trainer. Every day is an experiment. On a dry winter day, the moment you reach for a metal doorknob… ZAP! ⚡ That unpleasant, voice-calling shock is something almost everyone has experienced. What exactly is that tiny spark? And in the Edo period, when its true nature was completely unknown, how […]

2025年10月30日 / Last updated : 2025年10月30日 桑子 研 Science

The Coil’s Secret: How to Catch the “Hold On a Minute!” Lag of Self-Induction

I’m Ken Kuwako, Science Trainer. Every Day is an Experiment. You flip the switch to “On!”, and electricity flows instantly with a “Zap!” A small light bulb lights up immediately. This is what we consider “normal.” But what if there was a “contrarian” component inside the circuit?You might flip the switch to say, “Time to […]

2025年10月30日 / Last updated : 2025年10月30日 桑子 研 Science

The Ammeter vs. Voltmeter Secret: Why Internal Resistance is the Key to the ‘Series vs. Parallel’ Rule

I’m Ken Kuwako, Science Trainer. Every Day is an Experiment. You probably learned in middle school science that “ammeters must be connected in series, and voltmeters must be connected in parallel.” You may have simply memorized it as “the rule,” but why must it be done that way? Ammeters and voltmeters look nearly identical. Perhaps […]

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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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