DIY Pulse Detector Using a Marshmallow

Did you know you can see your heartbeat using just a marshmallow and a matchstick? 🔥🫀 Alex Dainis shows how to do this simple science trick that lets you visualize your radial pulse — the blood flow from your wrist — in real time!

Here’s how it works:

Place a toothpick or matchstick into a mini marshmallow, balance it over your radial artery, and watch it move with each beat of your heart. It’s an awesome way to explore your circulatory system at home — and even test how your pulse changes before and after exercise. 🧠💪

Science doesn’t get more hands-on (or snack-based) than this.