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Gun

The 3D printed single-shot Liberator pistol in test fire mount (Photo: Defense Distributed...

The potential for 3D-printed guns has (unsurprisingly) generated a great deal of controversy, and the Liberator is no exception. Named after the WWII single shot pistol, this 3D-printed .380 caliber pistol is made of almost entirely of plastic and looks more like a nozzle for a water hose than a gun. The weapon has survived multiple firings with very little damage, inspiring enough confidence that designer Cody Wilson has now tested the gun by hand.  Read More

The cardboard rifles are available in three iterations: “Digital Ops,” “Zombie Slayer,” an...

Cardboard is a remarkably versatile material and capable of being so much more than mere disposable packaging – as highlighted by the cardboard bike, helmet, and church. We can now add functional toy rifle to the growing list of viable cardboard-constructed inventions, courtesy of the Paper Shooters build-it-yourself cardboard rifle kit.  Read More

When a paddle tries to return a supersonic ping-pong ball -- the paddle loses! (Photo: Mar...

The fastest serve ever recorded by a ping-pong player moved at about 70 mph (113 km/h). Professor Mark French of Purdue University's Mechanical Engineering Technology department and his graduate students, Craig Zehrung and Jim Stratton, have built an air gun for classroom demonstrations that fires a ping-pong ball at over Mach 1.2 (900 mph or 1,448 km/h). As the picture above shows, that's fast enough for the hollow celluloid balls to blow a hole through a standard paddle.  Read More

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