Just because it's illegal for people to smoke in certain areas, it doesn't necessarily mean they won't, and putting up a 'No Smoking' sign isn't much of a deterrent. So Joseph BelBruno, a chemistry professor from Dartmouth University, has turned his research on second-hand smoke into a new kind of smoke detector that's specifically tuned to detect cigarettes and marijuana, and then rat out the smoker.
from Gizmodo http://ift.tt/1zJQrtj
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