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.
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.