Water Rocket Launcher
Use household items to build an inexpensive water-powered rocket that can soar at 100mph.
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Create a 5-Minute Foam Plate Flying Falcon
Follow these steps to turn a foam plate into a soaring falcon!
Remaking History: Willebrord Snell and Triangulation
Build the simple surveyor’s instrument that made the first accurate maps on Earth.
Solder a Simple Dark-Detecting LED Circuit
This simple circuit switches an LED on when the lights go out with just five parts — a battery, phototransistor, resistor, LED, and transistor.
How to Connect Optical Fibers to LEDs and Sensors
Skip the store-bought couplings and make these easy DIY fiber optic hookups.
1+2+3: Cosmic Ray Detector
Build this simple cloud chamber at home and detect cosmic-ray muons, electrons, and alpha particles.
Recreate a 140-Year-Old Brushless Motor on a 3D Printer
3D-print this 1872 replica Electro-Magnetic Engine that works like your drone’s modern motors.