Interest: Solder w/o Electricity, Easy Solar Heater, Super Light Quadcopter

How to Solder Without Electricity (or a Soldering Iron) (Instructables) http://www.instructables.com/id/How-to-Solder-Without-Electricity-or-a-Soldering-I/ Cheap and Easy Solar Heater (Instructables) http://www.instructables.com/id/Cheap-and-Easy-Solar-Heater/ How To: Solar Heater (Instructables) velacreations.com/howto/solar-heater/ BONUS: Super Light Quadcopter http://www.instructables.com/id/Super-Light-Quadcopter/