An inexpensive Photometer and Colorimeter
Replace/Upgrade/Repair Power Tool Batteries - SAVE 50% or more!
How to rebuild a Dewalt 14.4v battery pack
Galileo's Finger - An Open Source Astronomy Learning Tool
Reviving an AutoDarkening Welding Helmet
Real Hoverboard Hovercraft
Make a working key from scrap metal by reverse engineering a lock
How to fit a digital readout to a lathe
Underwater Video Camera / Camcorder Housing for less than $50
Underwater Camera Housing for small video camera
Underwater Housing for miniDV
Motorized Marble Roller Coaster
The Stirling Engine, absorb energy from candles, coffee, and more!
PVC FRUIT PICKER
Car Dash Camera Mount
Make a $200 "tactical" flashlight for about $15
Bring Dead Ni-Cad Batteries Back To Life
Lego brick shaped gummy candies
Cheap Y-Axis Digital Read Out
Homemade Shot/Grit Blasting Cabinet
How to Make a Heat Sealer
Cheap Portable Chroma Key Screen (Bluescreen)
Make your own Borromean rings! (You know you want to.)
Fnorgn! Making Tim Conway's Siamese Elephants
How to Turn Junk Mail and Paper into Very Nice Bowls
Solar parabolic cooker with the mechanical mathematician!
Sharp low-noise photography using multiple photos
Laser cutter, start slicing stuff for under 50 dollars
Giant Fresnel Lens Deathray: An Experiment in Optics
Mysterious Lightbulb Prank
Laser Image Projector
DIY : Eggstractor
How to build a "Flexi-Perch" Squirrel-proof birdfeeder for $10 or less
12 Volt Battery Hack! You'll be Surprised...
Portable Film Can Cannon! Advanced Version!
$100 Super Bright Flashlight for under $10!
Third, fourth, and possibly fifth, hand