The U.S. Department of Homeland Security developed a 'dazzler' -- a non-lethal weapon which uses flashing lights to distrupt a target's equilibrium. A person effected by lights for long enough, will temporarily lose visual acuity, balance, and become nauseous. The government spend about $1 million on the project. Limor Fried, a MIT-educated engineer, decided that she could build one for a lot less money. She's made her design schematics and source code available for free online. Below is a video of the results of her work.
| Fried' s Bio
| Image: AdaFruit Industries