Alcohol-related accidents kill 16,000 Americans a year, but drugs like cocaine, marijuana, angel dust, and amphetamines also take their toll. Enter Impact, which examines saliva for as many as 10 drugs in less than 5 minutes. Inside the device, saliva mixes with fluorescent chemicals that bind to drug or alcohol molecules. If either is in your system, the computer picks up the fluorescence.
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Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.


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