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X-Ray Vision Can See Through Concrete Wall...sorry, you cannot view external links. To see them, please
REGISTER or LOGIN It looks like most of these devices surround the item being imaged, but it should also work unidirectional.Did you read about seeing around corners?http://www.thenakedscientists.com/HTML/content/news-archive/news/2526/As far as the distinctive heartbeat, I'm seeing a few notes on the WWW....sorry, you cannot view external links. To see them, please
REGISTER or LOGINThe system apparently requires and EKG, and thus a minimal of 2 points of physical contact with the system. I'm doubting you would get enough accuracy from a purely auditory system without direct contact to the body like a stethoscope. The article doesn't seem to indicate whether it takes a single beat (about a second of contact), or if it requires multiple beats. How accurate would it be with a million individuals? A billion?Are there places where a person naturally puts both hands for extended periods of time? Escalator Railings? Steering Wheels?