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Cool, simple, durable, affordable, and easy to build ps2 gt4 racing cage
Chluaid's 10-minute Monkey Fist
Wind Power Generators
CO2 laser that cuts sheet metal
The accidental pocket jet engine...
Create a hardware store jet engine!
Jet Engine Made Out Of Empty Beer Cans!
How To Make A Jet Pack for $30
How to Make a Three Axis CNC Machine (Cheaply and Easily)
An Algae Bioreactor from Recycled Water Bottles
Simple Algae Home CO2 Scrubber - Part 1