The US Department of Homeland security is working on a flashlight that will upset your stomach. Literally. A pulse of high energy light can cause waves of nausea -- making it easy to subdue bad guys. You might suspect it projects bad TV movies or something like that, but it actually uses LEDs pulsed at a specific frequency. Best not to leave this in your toolbox by accident.
Read all about it at the Technology Review:
www.technologyreview.com
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