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Metal USB - Flash drive case mod
Geodesic Dome Greenhouse
Hydroponic Bog Garden (Water Recycling)
How to "make" plastic
Dumpster Dipping (for a small planet or just for fun)
How to make a RFID pet food access control system
"Drop Down", Quake-style command prompt for Windows
Hack a Toilet for free water.
Free Air Conditioning
Rain or Shine Solar Charger
Solar Thermal Water Heater For Less Than Five Dollars