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2026年6月17日 / Last updated : 2026年6月17日 桑子 研 Science

Hidden Math in the Playground! Why a Spiral Looks Like a Circle—or a Sine Wave

I’m Ken Kuwako, the Science Trainer. Every day is an experiment. When you’re playing in a park, you might stumble upon hidden treasures of mathematics and physics in the most unexpected places. The other day, a familiar piece of playground equipment caught my eye. It traced a beautiful spiral path through space. At first glance, […]

2026年6月16日 / Last updated : 2026年6月16日 桑子 研 Science

The Deeper the Vacuum, the More Colors It Holds! The Mysterious World of Vacuum Tubes Glowing Under High Voltage

I am Ken Kuwako, a science trainer. Every day is an experiment. In a pitch-black room, a glass tube glows softly. Blue, pink, orange… like shifting aurora light. This is neither special lighting nor CG. It is a physics experiment in which the color changes depending on the degree of vacuum. In this article, we […]

2026年6月15日 / Last updated : 2026年6月15日 桑子 研 Science

Feel It, Learn It! Free GeoGebra Simulation to Experience Wavelength, Period & Wave Speed

Hi, I’m Ken Kuwako, Science Trainer. Every day is an experiment. Waves are kind of magical when you think about it. Drop a stone in a pond and ripples spread outward. Sound reaches your ears as a wave. The video you’re watching on your phone right now? That’s riding in on radio waves. Yet the […]

2026年6月14日 / Last updated : 2026年6月14日 桑子 研 Science

Powered by Temperature Difference Alone! Why This 200-Year-Old Invention Still Amazes Us (The Stirling Engine)

I’m Ken Kuwako, your Science Trainer. Every day is an experiment. It’s Hard to Believe a Single Alcohol Lamp Can Produce This Much Power “If you simply bring a flame close to it, the machine starts spinning all by itself.” Sounds a little like magic, doesn’t it? But this is actually a genuine piece of […]

2026年6月13日 / Last updated : 2026年6月13日 桑子 研 Science

Lemons Pop Balloons?! The Hidden Science of “Limonene Balloons” — Dissolving, Not a Chemical Reaction!

I’m Ken Kuwako, the Science Trainer. Every day is an experiment. Just pressing a lemon peel against a balloon can make it burst with a loud pop. It sounds incredibly simple, yet when you witness it firsthand, it feels almost impossible to believe. It’s the kind of experiment that instantly makes people say, “Wait… why […]

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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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