To make a Gauss gun, all you need is a piece of metal rail, two magnets and steel ball bearings that fit on the rail. Then rig it up, and you have your own magnet-powered gun that shoots ball bearings!
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Recharge non-rechargeable alkaline batteries
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Record conversations secretly
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Eavesdrop from a Distance with This DIY Parabolic 'Spy' Microphone
How To:
Make a sneaky, snake spy camera that records video
How To:
Fix Dead Lithium-Ion Batteries That Won't Hold a Charge Anymore
How To:
Light a light bulb with a potato battery
How To:
Make a satellite dish Wi-Fi antenna for free internet
How To:
Build a mini hovercraft with household items
How To:
Get your PSP hooked up to the Internet without needing wifi
How To:
Make a Spot Welder for Cheap!
How To:
Build Your Own Kinect-Like 3D Tracking Interface with Cardboard, Foil, and Arduino
How To:
Quick-N-Dirty Circuit Board Repair: How to Patch Faded or Corroded Traces with Pencil Lead
How To:
DIY Stick Welder from Old Microwave Parts
How To:
Hack Your Electricity Meter
How To:
Make a Super Cheap One-Way Check Valve
How To:
Extract an RFID chip from a card & make it wearable
How To:
Build an analog light organ (a colorful sound-to-light circuit)
How To:
Build a laser microphone
How To:
Hack Your Mini-Fridge into a Vending Machine to Take Care of Freeloading Friends at Your Next Party
How To:
Hack a coin operated laundry machine
How To:
Record conversations secretly
How To:
Recharge non-rechargeable alkaline batteries
How To:
Use Your "Dead" Car Battery to Power Emergency Fans, Lighting, and More!
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