I’m Ken Kuwako from Science Trainer. Every day is an experiment. Have you ever heard that light can bend? The bottom of a swimming pool looks shallower than it really is, and a straw in a glass of water appears broken. These are all caused by light changing direction. But surprisingly few people can explain […]

I’m science trainer Ken Kuwako. Every day is an experiment. 【This article is also available as a radio talk!】 “Why don’t ships sink?” “Why does ice float on water?” At some point as kids, we’ve all wondered about questions like these. Surprisingly, the answers are hidden inside just two scientific ideas: density and buoyancy. Today, […]

I’m science trainer Ken Kuwako. Every day is an experiment. Stretch a balloon, and it heats up. Let it snap back, and suddenly it feels cold. It sounds like a simple little trick, but this tiny experiment is actually tied directly to some of the deepest ideas in physics. Today, let’s uncover the fascinating connection […]

This is Kuwako Lab, your science trainer. Every day is an experiment. “Sensei, why doesn’t total internal reflection happen when light goes from air into water?” One day, I found this question scribbled in the corner of a student’s notebook. It looks simple at first glance, but it actually opens the door to a surprisingly […]

This is Kuwako Lab, your science trainer. Every day is an experiment. What if I told you that an ordinary bento box lid could transform into an adorable keychain? All you need is a toaster oven and the plastic lid itself. Sounds impossible, right? But behind this simple craft lies some surprisingly fascinating plastic science. […]