1. Super-vision
The briefcase-sized Prism 200 from UK firm Cambridge Consultants can detect people through brick walls by firing off pulses of ultra-wideband radar and listening for returning echoes.
According to the company, these pulses can pass through building materials over 40 centimetres thick, and spot activity over a range of up to 15 metres.
The device could be used to track people in hostage situations, the company suggests, but it has a crucial weakness. To avoid being blinded by walls and other fixed structures, it is designed to only register objects that generate rapidly varying echoes. In other words, it can only detect people when they move.
(Image: Cambridge Consultants)