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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 […]

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

Why Does the Weight Move? Discover the Wonders of Electricity and the Secret of Grounding with the “Electrostatic Bell”! (For Middle Schoolers)

Ken Kuwako, Your Science Trainer. Every Day is an Experiment! Hello, budding scientists and curious minds! I’m Ken Kuwako, and today, we’re diving into an experiment that is deceptively simple yet profoundly insightful. It’s the Electrostatic Bell, a fantastic project created by our very own science club students. If you’re wondering, “What exactly is an […]

2025年10月29日 / Last updated : 2025年10月29日 桑子 研 Science

Planetary Power in Your Hand: The Shocking Science of the Iron Rod Magnet

I’m Ken Kuwako, a Science Trainer. Every Day is an Experiment! Imagine turning a plain iron rod into a magnet just by hitting it with a hammer—wouldn’t you call that magic? I recently gave a lecture in Nagano Prefecture after being invited by the Physical and Chemical Society. 【講演】黒板とタブレットの素敵な出会い 〜ある理科教師が見つけた未来の授業のカタチ〜@長野 While I was there, I […]

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運営: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。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
My mission is to share the joy, wonder, and excitement of science with as many people as possible. As a Science Trainer, I stay busy supervising and appearing on science-themed TV programs, hosting hands-on experiment workshops, and authoring science books.

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