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Cheap Welding for Punks
Improvised Gas Mask
Expanding-Lung on the cheap! Dive further, deeper, longer on one breath.
Joule Thief Charger
Make an amazing sports noisemaker!
Ultrabright LED Emergency Lamp (Rechargeable!)
DIY Portable USB Solar Charger ($20 - 4 Ports)
How to make cheap but very powerful LED bulbs
Simple No-Weld Bike Trailer