Use Polarizing Film to Locate the Sun on Overcast Days 10/25/2017 Locate the sun on overcast days with this ingenious Viking invention.
Mix Lard and Lye for DIY Soap 06/02/2017 When Dr. Ignaz Semmelweis noticed high fatality rates in his maternity ward, he introduced soap. Learn the basics of homemade...
Keep Cool Anywhere with a Battery-Powered Air Conditioner 12/20/2016 Air conditioning is simpler than you'd think. Build a simple battery-powered portable cooler to stay fresh in the summer.
Pitch Wiffle Balls with a Leaf Blower and PVC 11/01/2016 Put the world’s most obnoxious yard tool to batter use!
Build a Simple Transistor-Amplified Touch Switch 08/29/2016 Learn the history of the tech that gave us radio, TV, computers, and the Marshall stack — and then build...
Build a “Tantalus Cup” with a Hidden Siphon to Prank Your Friends 08/02/2016 Learn this party trick first pioneered by the ancient trickster/tinkerer Ctesibius. The siphon in this cup will quickly teach you...
Rock Out with a Simple, Moving Coil Loudspeaker 05/09/2016 Here's an easy loudspeaker project. Build the moving-coil, direct-radiation transducer that has rocked our world for 90 years.
Explore the Venturi Effect with a DIY Vacuum Pump 02/03/2016 Make your own vacuum pump for less than $25.
Remaking History: Willebrord Snell and Triangulation 08/28/2015 Build the simple surveyor’s instrument that made the first accurate maps on Earth.
How Henry Bessemer Helped Forge the Age of Steel 07/29/2015 While looking for a way to strengthen cannon barrels, Bessemer discovered better ways of making steel.
