In this video I see how fast we can get a radiometer to spin by shining the world's brightest flashlight on it. Then I talk about the real reason the Crookes radiometer spins when you shine light on it. I talk about thermal transpiration and how it works. Flashlight Imalent MS18: https://www.imalentstore.com/products/imalent-ms18-100000-lumen-flashlight