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Batteries From Everyday Things
Sneaky batteries are everywhere!
In Weird Science from MAKE: schoolsout: School's Out page 85

Mini Foosball Game
With just a few straws, paper clips, and a common 3-bag microwave popcorn box, you can quickly put together your own Sneaky Mini Foosball Game.
In 123 from MAKE: 28: Toys and Games page 82

Sneaky UV Ink Password Protector
Write your computer passwords with an ultraviolet (UV) invisible ink pen so the information can’t be seen by the naked eye, and hide the UV light.
In 123 from MAKE: 28: Toys and Games page 169

Action Root Beer Pong
Bring back the fun of beer pong by adding motion, with your own pong toy that scuttles about.
In 123 from MAKE: 27: Robots page 115

Urban Survival Button
Prepare yourself by making a Sneaky Button Survival Kit, which contains practical items you can use to protect yourself in urban situations.
In 123 from MAKE: 25: Microcontrollers and Arduino page 40

Sneaky Milk Plastic
When separated from milk by using an acid such as vinegar, casein becomes a moldable plastic material that can be used to create everything from glue to fabric to billiard balls.
In 123 from MAKE: 24: Space page 116

Hypsometer
Using simple trigonometric principles, you can closely estimate the height of objects with an easy-to-make-hypsometer (hyps means height in Greek).
In 123 from MAKE: 23: Gadgets page 110

Cup Positioning System
Use a cup to put you in your place.
In 123 from MAKE: 21: Desktop Manufacturing page 30

Batteries From Everyday Things
Power an LED with lemons or spare change.
In 123 from MAKE: 19: Robots page 110

Mechanical Image Duplicator
With a few everyday items found in the home, you can make a pantograph.
In 123 from MAKE: 17: Lost Knowledge page 136

Sneaky Sleeve Pocket
Stick a secret compartment inside your jacket for hush items you want to stash.
In DIY: Hide It from CRAFT: 06: Play page 97

Candy Alert
Devise sneaky uses for high-tech candy packaging and other small toys.
In 123 from MAKE: 13: Magic page 112

Boomerang
Make a real boomerang out of cardboard and foam rubber.
In 123 from MAKE: 12: Upload page 77

Easy Motor
Make a spinning motor with a minimum of parts.
In 123 from MAKE: 11: Alt Vehicles page 126

Origami Flying Disc
Understand Bernoulli's principle of flowing fluids and gases with a paper flyer.
In 123 from MAKE: 10: Home Electronics page 167

Aircraft Band Receiver
Modify an AM/FM radio to pick up air traffic control communications.
In 123 from MAKE: 09: Fringe page 27

Shaker Flashlight Power Source
Powering small electronics with your muscles.
In 123 from MAKE: 08: Toys and Games page 48

Magnetic Switches from Everyday Things
Control many devices from afar with the magnetically sensitive Sneaky Switch.
In 123 from MAKE: 07: Backyard Biology page 51

Sneaky Uses for Everyday Things
Turn a remote control car into an alarm system.
In 123 from MAKE: 05: Science, Weather, and Outdoors page 113

Sneaky Uses for Everyday Things
Turn a cup into a speaker and a microphone.
In 123 from MAKE: 04: Music and Kits for the Holidays page 152