 When's the last time you just played with something for the fun of it? Well, magnet film is a good something and it's very science. Magnet film contains tiny capsules filled with oil and flakes of nickel. Magnetic fields move these flakes around. When they're lying flat, they reflect light and appear bright. And when they're standing up, they look darker. So that's neodymium magnets. How about we try a magnetic work mat? The entire surface is just rows of alternating polarity. You can even use them to comb and rearrange the nickel particles. Of course, I can't ignore these small spherical magnets. Lovely.