Latest from Forrest M. Mims III


Create a simple light detector to create a light pollution survey of your town or county to find out where your local dark sites are. Read more »

Figure E

No batteries, no switches — this analog meter is powered by the sunshine it’s measuring. Read more »


Use a laser pointer with a DIY oscillating optical fiber pendulum to detect and record movements of the Earth. Read more »


Airport security is already a hassle for most people. When you're a scientist traveling with electronic components, it's a nightmare. Read more »


Skip the store-bought couplings and make these easy DIY fiber optic hookups. Read more »


Have fun and do science by flying toy rockets with an LED tracking light. Read more »

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Detect motion and even individual footsteps with DIY sensors better than your smartphone’s. Read more »