20 Awesome Products And Design Ideas - StumbleUpon September 2, 2011 | 48 Comments » | Topics: Design, Pics Hot Stories From Around The Web Other Awesome Stories YouTube to MP3 - Convert YouTube videos to MP3 Absolutely Genius Ideas - StumbleUpon data-original="images/genius/29.jpg" class="lazy image"/> data-original="images/genius/75.jpg" class="lazy image"/> You Built What?!: A Compact Mechanical Crossbow With the Precision of a Laser Last October, after hurting his knee playing hockey, Patrick Priebe was holed up in his apartment near Cologne, Germany, with nothing to do. He was sitting at his computer, staring at his keyboard, when the "Y" key caught his eye. Priebe didn't see a letter. To him, it looked like a crossbow. Immediately he knew what his next project would be. For years, the German lab technician had built laser weapons, including a working Iron Man–style palm-fired blue-diode laser. Next he gathered more aluminum, copper, and brass sheeting. To fire, he pulls back the wire, hooks it around a brass block, and places an arrow in the groove. Priebe can use the crossbow to pierce soda cans, smash lightbulbs, and tag apples. Go on to the next page for three more DIY projectile launchers.
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