Looking for something you're sure you won't find? Even if the item you seek is close by, a doubtful attitude reduces your chances of finding it, claims a new study funded by the US Department of Homeland Security.
The US Department of Homeland Security has funded the creation of a non-lethal weapon called the Dazzler that's basically a flashlight that causes disorientation, nausea, and vomiting. Now you can make one too! Hardware hackers from Adafruit explain it all.