Although magnetism is invisible to our eyes, it powers much of daily life. It drives the electric motors of just about anything that spins: fans, power tools, and blenders. It powers the microphones and speakers in our various gadgets. And it’s crucial for storing information – by which we don’t just mean pinning notes to the fridge.
Magnetism enables you to click “save,” power down your computer, and walk away with the peace of mind that your documents, photos, and music will still be th